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CHNG IV. DAO NG V SNG IN TI. Dao ng in t. Mch dao ng LC.

1./ Mch dao ng l mch kn gm mt t in c in dung C mc vi cun dy cm thun c t cm L c in tr r 0.

Sau khi t c tch in, n phng in qua cun cm v to ra trong mch LC mt dao ngin t t do.

- in tch hai bn t, hiu in th hai bn t v dng in qua cun cm bin thin iu ha vi

cng: Tn s gc ring:1

LC= Tn s ring:

1

2

fLC

=

Chu k ring: 2T LC= v0

0

2 2 QT LCI

= =

2./ Dao ng in t t do trong mch dao ng

Chn t = 0, q = q0 v i = 0 = 0 khi :

- in tch v dng in:q = q0 cos (t) v i = I0 cos (t + 2

) vi I0 = q0-in p hai u cun cm thun (hoc hai u t): u = 0 os

qc t

C ( V)

Nhn xt: - Cng dng in i trong mch dao ng LC sm pha hn in tch q, in p

mt gc2

.

3./ Nng lng in t trong mch dao ng LC.Gi s in tch bin thin iu ha: q = q0cos t .+) Nng lng in trng trong t in:

WC =2

1qu=

20

2

q

Ccos2(t) = W0 cos2(t)

+) Nng lng t trng trn cun cm:

WL = 2

1

Li

2

= 2

1

L2

qo2

sin

2

(t) =

20

2

q

Ccos

2

(t) = W0 sin2

(t)+) Nng lng in t: W = WC + WL =

20

2

q

C=

2

1LIo2 =

2

1CUo2 = W0 = hng s (khng i theo t)

- Nng lng in trng v nng lng t trng bin thin iu ho vi tn s gc = 2 , f = 2fv chu k T =

2

T.

- Trong qu trnh dao ng lun c s chuyn ha qua li gia nng lng in v nng lng t.Tng nng lng in trng v nng lng t trng ca mch gi l nng lng in t, bo

ton( khng i theo thi gian)

II. in t trng.1./ in trng xoy.

- in trng xoy c cc ng sc l cc ng cong kn, bao quanh cc ng sc ca ttrng. (Khc vi ng sc ca in trng tnh)

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- Ti bt c ni no, khi c s bin thin ca in trng th u xut hin t trng v ngc li.2./ T trng xoy c ng sc ca t trng bao gi cng khp kn3./in t trng:

- S bin thin v chuyn ha lin tc ca in trng v t trng trong khng gian gy ra int trng.

- in t trng lan truyn trong khng gian vi tc bng tc nh sng: c = 3.108m/s.- in t trng bin thin tun hon theo thi gian, khng gian.

III. Sng in t.1./ Sng in tl in t trng lan truyn trong khng gian, k c chn khng.2./c im ca sng in t.

- Sng in t lan truyn trong chn vi tc bng tc ca nh sng: c = 3.108m/s.- Sng in t l sng ngang, ti mt im bt k trn phng truyn vc t cng in

trng E v vc t cm ng t

B vung gc vi nhau v vung gc vi phng truyn sng.

(E B phng truyn sng)

- E v

B u bin thin tun hon theo khng gian v thi gian v lun lun ng pha.3./Tnh cht ca sng in t.

- C y cc tnh cht ging nh sng c hc. Phn x, khc x, giao thoa..- Truyn c trong mi mi trng vt cht v c trong chn khng.- Tn s ca sng in t l tn s ca trng in t.

- Bc sng ca sng in t trong chn khng: =83.10

( )c

mf f

= .

- Mang nng lng.- Sng in t truyn t mi trng ny sang mi trng khc: tn s khng i, vn tc, bc

sng thay i.4./ ng dng ca sng in t.

- Sng in t dng lm sng mang chuyn ti cc dao ng m thanh, hnh nh i xa bng

phng php bin iu.LOI SNG BC SNG TN S ng dng

Sng di 100km -1km 3 300 KHz Nng lng thp, thng tin di nc

Sng trung 100m-1000m 0.3 - 3 MHzBan ngy b tng in ly hp th nn khngtruyn c xa,ch truyn tt vo ban m.

Sng ngn 10m -100 m 3 - 30 MHzPhn x trn tng in ly, nn truyn n miim trn Tri t

Sng ccngn

0,1 m-10m 30 3.104 MHzKhng phn x trn tng in ly truyn lnv tinh VTTH

5. S khi ca my pht thanh v tuyn in n gin:

My pht My thu

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(1): Micr.(2): Mch pht sng in t cao tn.

(3): Mch bin iu.(4): Mch khuych i.(5): Anten pht.

(1): Anten thu.(2): Mch khuych i dao ng in t cao tn.

(3): Mch tch sng.(4): Mch khuych i dao ng in t m tn.

(5): Loa.

6. Nguyn tc thu sng in t: Da vo cng hng in ttrong mch LC (f = f0)

- Tn s thu khi c cng hng in t: f = 01

2f

LC= (Hz)

- Bc sng in t thu c l: = cT= c2 LC(m).- Chu k sng in t thu c: T = 0 2T LC=

CHNG V. SNG NH SNG .

I. Tn sc nh sng.* Tn sc nh sng l hin tng lng knh phn tch mt chm sng phc tp thnh nhng chm

sng c mu sc khc nhau.* nh sng n sc l nh sng khng b tn sc khi qua lng knh.* nh sng trng l s tng hp ca nhiu nh sng n sc c mu t n tm.* Chit sut ca mi trng trong sut ph thuc vo mu sc ca nh sng n sc, ln nht i vi

tia tm v nh nht i vi tia . * Chit sut:v

cn = vtm < v

II. Nhiu x nh sng, giao thoa nh sng.1. Nhiu x nh sng: l hin tng nh sng khng tun theo nh lut truyn thng, khi nh sngtruyn qua mt l nh, hoc gn mp nhng vt trong sut hoc khng trong sut2. Kt qu th nghim Young v giao thoa nh sng:

- i vi nh sng n sc: l mt vng sng hp trong c nhng vn sng , vn ti xen k,song song v cch u nhau.- i vi nh sng trng: ti im gia O c mt vn sng trng, hai bn l nhng vn sng,vn ti chng cht hn n c dng cc di sng cu vng tm trong ngoi.

3. Cng thc giao thoa nh sng:

a) Khong vn: l khong cch gia hai vn sng (hoc ti) cnh nhauD

i a

=a = S1S2: khong cch gia hai khe sng, : bc sng ca nh sngD: khong cch t hai khe sng ti mn hng vn (E)

b) V tr vn sng: xk =D

ka

= ki ( k = 0, 1, 2, gi l bc giao thoa)

c) V tr vn ti: xt =1

( )2

Dk

a

+ = (k +

1

2) i vn ti th n ng vi: k = (n 1)

4. Mi nh sng n sc c mt mu xc nh, ng vi mt bc sng (tn s) xc nh

Trong chn khngf

c= c = 3.10 8 (m/s), trong mi trng chit sut n:

n

=/

5. nh sng trngc mi bc sng trong khong t 0,38m (tm) n 0,76m ()

+ rng quang ph bc k:a

Dkx tdk )( =

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6. Khi chiu vo khe S ng thi hai nh sng n sc c bc sng1 , 2: th trn mn c hai hvn ca hai nh sng n sc , ng thi xut hin mt s vn trng (i mu)

Ti v tr vn trng (hai vn sng trng nhau): 1 2 1 1 2 2k kx x k k = =

III. My quang ph l dng c dng phn tch chm sng phc thnh nhng thnh phn n sckhc nhau.

Cu to v hot ng:c ba b phn chnh:ng chun trc l b phn to ra chm sng song song.

Lng knh c tc dng phn tch chm sng song song chiu ti, thnh nhng chm sng n scsong song.Bung nh l b phn dng thu (chp) nh quang ph.Mi chm sng n sc tao ra trn knh nh mt vch mu n sc. Tp hp cc vch mu n sc to thnh quang ph ca ngun S.

IV. Phn tch quang phPhn tch quang ph l phng php vt l dng xc nh thnh phn ha hc ca mt cht hay

hp cht , da vo vic nghin cu quang ph ca nh sng do cht y pht rau im:Nhanh, chnh xc, ch cn lng nh mu vt, C th phn tch c cc vt xa

V. Cc loi quang ph

Quang ph Quang ph lin tcQuang ph vch pht

xQuang ph vch hp th

nhngha

Gm nhiu di mu t n tm, ni linnhau mt cch lin tc

Gm cc vch mu ringl ngn cch nhau bngnhng khong ti

Nhng vch ti ring l trn nnquang ph lin tc

Ngunpht

Do cht rn, lng, khp sut cao khi ckch thch pht ra

Do cht kh p sut thpkhi c kch thch phtra

Nhit ca m kh hp thphi thp hn nhit cangun pht sng.

Tnh chtng dng

Khng ph thuc vobn cht ca ngunsng,ch ph thuc vonhit ca ngunsng Dng o nhit ca

ngun sng

Mi nguyn t ha hcc quang ph vch ctrng ring ca n ( vs vch, mu vch, v trvch,..) Dng xc nh thnh

phn cu to ca ngun

sng

mt nhit nht nh mtvt c kh nng pht x nhng

bc x n sc no th ng thicng c kh nng hp th nhng

bc x n sc

Quang ph vch hp th caMi nguyn t c tnh cht ctrng ring cho nguyn t

Dng nhn bit s c mt cacht hp th

VI. Cc loi Tia (bc x) khng nhn thy

Bc x Tia Hng ngoi Tia T ngoi Tia Rn ghen (Tia X)

nhngha

L bc x khng nhn thyc bn cht l sng in t,c bc sng di hn bc

sng tia

L bc x khng nhn thyc bn cht l sng in t,c bc sng ngn hn

bc sng tia tm

L bc x khng nhn thy cbn cht l sng in t, cbc sng ngn hn bcsng tia t ngoi

Ngunpht

Mi vt b nung nng upht ra tia hng ngoi

Do vt b nung nng t20000C tr ln pht ra

Tia X c to ra bng ngRn-ghen hay ng Cu-lit-gi

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Tnhcht

cngdng

Tc dng knh nh Tc dng nhit c th bin iu nh ST gy ra hin tng quangin+ Dng sy kh, si m+ Chp nh vo ban m

+ Dng iu khin t xa

Tc dng knh nh Tc dng pht quang,ion ha khng kh

Tc dng sinh hc gy phn ng quang hp gy ra hin tng quangin b nc, thy tinh hp th+ Dng tit trng, cha bnhci xng+ d tm vt nt trn b mtkim loi.

Tc dng knh nh Tc dng pht quang,ion ha khng kh Tc dng sinh hc gy ra hin tng quangin C kh nng m xuyn+ Dng chiu , chp in,cha bnh ung th+ kim tra khuyt tt ca sn

phm c.

VII. Thuyt in t v nh sng.Bn cht ca nh sng l sng in t c bc sng rt ngn lan truyn trong khng gian.

Mi lin h gia tnh cht in t v tnh cht quang ca mi trng:v

c= n

VIII . Thang sng in tCc sng v tuyn in, tia hng ngoi, nh sng nhn thy, tia t ngoi, tia X, v tia gammau c cng mt bn cht l sng in t, chng ch khc nhau v bc sng ( tn s).+ Cc tia c bc sng cng ngn th hin tnh cht ht c tnh m xuyn cng mnh, d tcdng ln knh nh, d lm pht quang cc cht v ion ha khng kh.+ Cc tia c bc sng di th hin tnh cht sng, ta d quan st hin tng giao thoa.

Nu sp xp theo th tbc sng gim dn ( tn s tng dn) ta c mt thang sng int nh sau: Sng v tuyn, tia hng ngoi, nh sng nhn thy, tia t ngoi, tia X, tiagamma

CHNG VI. LNG T NH SNGI. Hin tng quang in1. Th nghim ca Hc v hin tng quang in- Chiu nh sng h quang giu t ngoi vo tm km tch in m lm bt lectron khi mt tm km.2. nh ngha Hin tng nh sng lm bt cc lectron ra khi mt kim loi gi l hin tng quangin (ngoi) Nu chn chm sng h quang bng mt tm thu tinh dy th hin tng trn khng xy rabc x t ngoi c kh nng gy ra hin tng quang in km.3. nh lut v gii hn quang in-nh lut: i vi mi kim loi, nh sng kch thch phi c bc sng ngn hn hay bng gii hnquang in 0 ca kim loi , mi gy ra c hin tng quang in. 0- Gii hn quang in ca mi kim loi l c trng ring cho kim loi .- Thuyt sng in t v nh sng khng gii thch c m ch c th gii thch c bng thuyt lngt.II. Thuyt lng t nh sng1. Gi thuyt Plng- Lng nng lng m mi ln mt nguyn t hay phn t hp th hay pht x c gi tr hon ton xcnh v hng hf; trong f l tn s ca nh sng b hp th hay pht ra; cn h l mt hng s.

2. Lng t nng lng = hf =

hch gi l hng s Plng h = 6,625.10-34J.s

3. Thuyt lng t nh snga. nh sng c to thnh bi cc ht gi l phtn.

b. Vi mi nh sng n sc c tn s f, cc phtn u ging nhau, mi phtn mang nng lng bng= hf.

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c. Phtn bay vi tc c = 3.108m/s dc theo cc tia sngd. Mi ln mt nguyn t hay phn t pht x hay hp th nh sng th chng pht ra hay hp th mt

phtn. Phton lun chuyn ng Khng c phton ng yn4. Gii thch nh lut v gii hn quang in bng thuyt lng t nh sng- Mi phtn khi b hp th s truyn ton b nng lng ca n cho 1 lectron.- Cng thng lc lin kt gi l cng thot(A).

- hin tng quang in xy ra: hf A hay ch A

hc

A

, t 0hc

A = 0

Ch tnh nhanh ta dng26

0

19,875.10A

= ch nh i 1eV =1,6.10-19 J

5. Lng tnh sng - ht ca nh sng: nh sng c lng tnh sng - ht.

III. HIN TNG QUANG IN TRONG

1. Cht quang dn - L cht bn dn c tnh cht cch in khi khng b chiu sng v tr thnh dnin khi b chiu sng.2. Hin tng quang in trong - Hin tng nh sng gii phng cc lectron lin kt chng tr

thnh cc lectron dn ng thi gii phng cc l trng t do gi l hin tng quang in trong.ng dng trong quang in tr v pin quang in3. Quang in tr L mt in tr lm bng cht quang dn.- Cu to: 1 si dy bng cht quang dn gn trn mt cch in.- in tr c th thay i t vi Mvi chc .4. Pin quang in1. L pin chy bng nng lng nh sng. N bin i trc tip quang nng thnh in nng.2. Hiu sut trn di 10%

III. HIN TNG QUANG PHT QUANG

1. Khi nim v s pht quang- S pht quang l s hp th nh sng c bc sng ny pht ra nh sng c bc sng khc.-c im: s pht quang cn ko di mt thi gian sau khi tt nh sng kch thch.2. Hunh quang v ln quang- S pht quang ca cc cht lng v kh c c im l nh sng pht quang b tt rt nhanh sau khi ttnh sng kch thch gi ls hunh quang.- S pht quang ca cc cht rn c c im l nh sng pht quang c th ko di mt thi gian sau khitt nh sng kch thch gi ls ln quang. Cc cht rn pht quang loi ny gi l cc cht ln quang.3. nh lut Xtc (Stokes) v s hunh quangnh sng hunh quang c bc sng di hn bc sng ca nh sng kch thch: hq > kt.

IV. CC TIN BOHR V CU TO NGUYN T:

1. Tin v cc trng thi dng- Nguyn t ch tn ti trong 1 s trng thi c nng lng xc nh, gi l cc trng thi dng. Khi trongcc trng thi dng th nguyn t khng bc x.- Trong cc trng thi dng ca nguyn t, lectron ch chuyn ng trn nhng qu o c bn knhhon ton xc nh gi l qu o dng.- i vi nguyn t hir rn = n2r0 r0 = 5,3.10-11m gi l bn knh Bo.Cc mc K L M N O P ng vi n =1,2,3,4,5,6...2. Tin v s bc x v hp th nng lng ca nguyn t

- Khi nguyn t chuyn t trng thi dng c nng lng (En) sang trng thi dng c nng lng thphn (Em) th n pht ra 1 phtn c nng lng ng bng hiu En - Em:

= hfnm = En - Em Tnh ( )m n

hc

E E=

ch nh i 1eV =1,6.10-19 J

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- Ngc li, nu nguyn t ang trng thi dng c nng lng Em thp hn m hp th c 1 phtnc nng lng ng bng hiu En - Em th n chuyn ln trng thi dng c nng lng cao hn En.Ghi nh khi t thp ln cao hp th v t cao tr v thp bc xV. S LC V LAZE:

1. Cu to v hot ng ca Laze- Laze l mt ngun pht ra mt chm sng cng ln da trn vic ng dng ca hin tng phtx cm ng.-c im:+ Tnh n sc. + Tnh nh hng. + Tnh kt hp rt cao. + Cng ln.2. Mt vi ng dng ca laze- Y hc: dao m, cha bnh ngoi da- Thng tin lin lc: s dng trong v tuyn nh v, lin lc v tinh, truyn tin bng cp quang- Cng nghip: khoan, ct..- Trc a: o khong cch, ngm ng thng- Trong cc u c CD, bt ch bng

CHNG VII. HT NHN NGUYN T .

I. Tnh cht, cu to, nng lng lin kt ht nhn:1. Cu to ht nhn , khi lng ht nhn:a. Cu to ht nhn:* Ht nhn c kch thc rt nh (khong 10-14 m n 10-15 m) c cu to t cc ht nh hn gi lnuclon.C 2 loi nuclon:

- proton: k hiu p mang in tch nguyn t +e; mp= 1,007276u- ntron: k hiu n, khng mang in tch. mp= 1,008665uHt nhn c in tch +Ze

* S nuclon trong mt ht nhn l: A = Z + N .A: gi l khi lng s hoc s khi lng nguyn t+ K hiu ht nhn

- Ht nhn ca nguyn t X c k hiu: AZ

X

- K hiu ny vn c dng cho cc ht s cp: 11p, 1

0n, 0

1e

.+ ng v:

* Cc nguyn t m ht nhn c cng s proton Z nhng c s ntron N khc nhau gi l ng v

V d: - Hydro c 3 ng v:1 2 31 1 1, ,H H H

* Cc ng v c cng s electron nn chng c cng tnh cht ha hcb. Khi lng ht nhn. n v khi lng ht nhn

1u =121 khi lng nguyn t cacbon 126 C, 1u = 1,66055.10-27kg

mp = 1,007276u; mn= 1,008665u2. Lc ht nhn:l lc lin kt cc nucln vi nhau

c im ca lc ht nhn:+ Lc ht nhn l loi lc tng tc mnh nht+ Lc ht nhn ch pht huy tc dng trong phm vi kch thc ht nhn. 10-15m+ Lc ht nhn khng ph thuc vo in tch cc nucln

3.Nng lng lin kt ca ht nhn:a, ht khi: m

- Khi lng ca mt ht nhn lun nh hn tng khi lng ca cc nucln to thnh ht nhn.

- chnh lch khi lng gi l ht khi ca ht nhn, k hiu mm = [Zmp + (A Z)mn mX] vi mX : khi lng ca ht nhnTrang 7

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c im ca hin tng phng x:* Hin tng phng x hon ton do cc nguyn nhn bn trong ht nhn gy ra, hon ton khng

ph thuc vo tc ng bn ngoi.* D nguyn t phng x c nm trong cc hp cht khc nhau, d cht phng x chu p sut

hay nhit khc nhau th mi tc ng u khng gy nh hng n qu trnh phng x ca htnhn nguyn t.2. Cc dng phng x:

a.Phng x :Ht nhn m X phn r to thnh ht nhn con Y, ng thi pht ra tia phng x : HeYX AZAZ 4242 + + Tia l chm ht nhn hli 42 He chuyn ng vi tc vo c 2.107 m/s, B lch v bn m ca tin . C kh nng ion ha mi trng rt mnh nng lng gim nhanh ch i c ti a 8 cm trongkhng kh, c kh nng m xuyn nhng yu.khng xuyn qua c t ba dy

b. Phng x Phng x -- Phng x - l qu trnh pht ra tia -. Tia - l dng cc lectron.- Dng tng qut ca qu trnh phng x -: vYX AZ

AZ

~001 + +

- Tia - chuyn ng vi vn tc gn bng vn tc nh sng- C kh nng lm in ha cht kh yu hn tia , nn c kh nng m xuyn mnh hn, i ckhong vi mt v c th xuyn qua tm nhm vi mm

Phng x +- Phng x + l qu trnh pht ra tia +. Tia + l dng cc pzitron ( e01 ).- Dng tng qut ca qu trnh phng x +: vYX AZ

AZ

001 + +

+

- Tia + chuyn ng vi vn tc gn bng vn tc nh sng- Ht + mang in tch +1e, li v sau 1 so vi ht nhn m

c.Phng x

- Cc ht nhn con c to thnh trong qu trnh phng x trng thi kch thch nhng khnglm thay i cu to ht nhn

- Tia gamma : c bn cht l sng in t c bc sng rt ngn (di 10-11m) khng nhn thyc. y l chm phtn nng lng cao, c kh nng lm en knh nh, lm in ha cht kh,ckh nng m xuyn rt mnh, v rt nguy him cho con ngi. Tia khng b lch trong intrng v t trng.3. nh lut phng x

* Mi cht phng x c c trng bi mt thi gian T gi l chu k bn r. C sau mi chu kth 1/2 s nguyn t ca cht y bin i thnh cht khc.

* Gi N0, m0 l s nguyn t v khi lng ban u ca khi lng phng x.Gi N, m: l s nguyn t v khi lng thi im t.

Ta c: N = NO. . 2t

t Te

= hoc m = mo. . 2t

t Te

=

T: l chu k bn r , l hng s phng x vi =ln 2 0,693

T T=

Bng quy lut phn r

t = T 2T 3T 4T 5T 6T

S ht cn li N0/2 N0/4 N0/8 N0/16 N0/32 N0/64

S ht phn r N0/2 3 N0/4 7 N0/8 15 N0/16 31 N0/32 63 N0/64

T l % r 50% 75% 87.5% 93.75% 96.875%

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T l r v cn li 1 3 7 15 31 63

ng dng phng x: Xc nh tui c vt, phng php nguyn t dnh du gy t bin gen

IV . C ch ca phn ng phn hch:

1. Phn ng phn hch l L s v ca mt ht nhn nng thnh 2 ht nhn trung bnh (km theo mtvi ntrn pht ra).

Phn ng phn hch kch thch n + X X* Y + Z + kn (k = 1, 2, 3)- Qu trnh phn hch ca X l khng trc tip m phi qua trng thi kch thch X*.2. Nng lng phn hch

- Xt cc phn ng phn hch:1 235 236 95 138 1

0 92 92 39 53 0* 3n U U Y I n+ + +

1 235 236 139 95 10 92 92 54 38 0* 2n U U Xe Sr n+ + +

a. Phn ng phn hch to nng lng- Phn ng phn hch 235

92U l phn ng phn hch to nng lng, nng lng gi l nng lng phn

hch.- Mi phn hch 235

92U ta nng lng 212MeV.

b. Phn ng phn hch dy chuyn- Gi s sau mi phn hch c k ntrn c gii phng n kch thch cc ht nhn 235

92U to nn nhng

phn hch mi.- Sau n ln phn hch, s ntrn gii phng l kn v kch thch kn phn hch mi.+ Khi k < 1: phn ng phn hch dy chuyn tt nhanh+ Khi k = 1: phn ng PHDC t duy tr, nng lng pht ra khng i nh my in ht nhn.+ Khi k > 1: phn ng PHDC t duy tr, nng lng pht ra tng nhanh, c th gy bng n Bom

nguyn t.3. Phn ng phn hch c iu khin- c thc hin trong cc l phn ng ht nhn, tng ng trng hp k = 1.- Nng lng to ra khng i theo thi gian.

V. Phn ng nhit hch:

1. Phn ng tng hp ht nhn l g?- L qu trnh trong hai hay nhiu ht nhn nh hp li thnh mt ht nhn nng hn.2 3 4 1

1 1 2 0H H He n+ + Phn ng trn to nng lng: Qto = 17,6MeV

2. iu kin thc hin- Nhit n c trm triu .3. Nng lng tng hp ht nhn- Nng lng to ra bi cc phn ng tng hp ht nhn c gi l nng lng tng hp ht nhn.- Thc t ch quan tm n phn ng tng hp nn hli

BI TP

Bai 1.Cho mch d in LC: C = 5F; L = 0,2 H.Xc nh chu k,tn s v bc sng ca mch d?

Bai 2. Mach chon song cua mot mat thu co cuon cam L= 1mH va mot tu

ien bien thien t 9,7pF en 92pF. Hoi may thu nay thu c song ien tco bc song trong khoang nao?Bai 3. Mach chon song cua may thu vo tuyen gom cuon day co o t camL = 2.10-6H, tu ien co ien dung C. e may thu ch co the thu c cac song

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ien t co bc song t 57m en 753m. Th tu ien nay phai co ien dungtrong khoang nao? Cho van toc truyen song ien t la 3.108 m/sBai 4: Mt mch d c C = 25pF v L = 10 -4H. Gi s thi im ban u (t= 0) cng dng in t cci v bng 40mA. Tm:A. Biu thc cng dng in?B. Biu thc in tch trn cc bn t?Ba i 7. Mch d LC c L = 1 H; in tr thun R 0. Biu thc d t do ca in tch trn t l :

8 7

q 2.10 cos(10 t )2

= +

(C).A. Tnh in dung ca t in?B. Vit biu thc cng dng in trong mch?

TRC NGHIM

Cu 1: Mt mch dao ng in t c tn s f = 0,5.106Hz, vn tc nh sng trong chn khng c = 3.108m/s.Sng in t do mch pht ra c bc sng l

A. 600m B. 0,6m C. 60m D. 6m

Cu 2: in trng xoy l in trngA. c cc ng sc bao quanh cc ng cm ng t B. gia hai bn t in c in tch khng iC. ca cc in tch ng yn D. c cc ng sc khng khp kn

Cu 3: pht biu no sau y l sai khi ni v nng lng ca mch dao ng in LC c in tr khng ngk?

A.Nng lng in trng v nng lng t trng cng bin thin tun hon theo mt tn s chungB.Nng lng in t ca mch dao ng bin i tun hon theo thi gianC.Nng lng in t ca mch dao ng bng nng lng t trng cc iD.Nng lng in t ca mch dao ng bng nng lng in trng cc i t in.

Cu 4: Khi ni v sng in t, pht biu no sau y l sai?A. Sng in t ch truyn c trong mi trng vt cht n hi.B. Sng in t l sng ngang.

C. Sng in t lan truyn trong chn khng vi vn tc c = 3.108

m/s.D. Sng in t b phn x khi gp mt phn cch gia hai mi trng.

Cu 5: Khi ni v in t trng, pht biu no sau y l sai?A. ng sc in trng ca in trng xoy ging nh ng sc in trng do mt in tch khng i,

ng yn gy ra.B. Mt in trng bin thin theo thi gian sinh ra mt t trng xoy.C. Mt t trng bin thin theo thi gian sinh ra mt in trng xoy.D. ng cm ng t ca t trng xoy l cc ng cong kn bao quanh cc ng sc in trng.

Cu 6: Coi dao ng in t ca mt mch dao ng LC l dao ng t do. Bit t cm ca cun dy l L =2.10-2 H v in dung ca t in l C = 2.10 -10 F. Chu k dao ng in t t do trong mch dao ng ny l

A. 4.10-6 s. B. 2 s. C. 4 s. D. 2.10-6 s.

Cu 7: Mt mch dao ng in t LC, c in tr thun khng ng k. Hiu in th gia hai bn t in binthin iu ha theo thi gian vi tn s f . Pht biu no sau y l sai?

A.Nng lng in trng bin thin tun hon vi tn s 2 f .B.Nng lng in t bng nng lng in trng cc i.C.Nng lng in t bng nng lng t trng cc i.D.Nng lng in t bin thin tun hon vi tn s f .

Cu 8: Mch dao ng in t LC l tng gm cun cm thun c t cm 1 mH v t in c in dung0,1F. Dao ng in t ring ca mch c tn s gc l

A. 2.105 rad/s. B. 105 rad/s. C. 3.105 rad/s.D. 4.105 rad/s.

Cu 9: Sng in tA. l sng dc. B. khng truyn c trong chn khng.C. khng mang nng lng. D. l sng ngang.

Cu 10: Khi mt mch dao ng l tng (gm cun cm thun v t in) hot ng m khng c tiu hao nnglng th

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A. thi im nng lng in trng ca mch cc i, nng lng t trng ca mch bng khng.B. cng in trng trong t in t l nghch vi din tch ca t in.C. mi thi im, trong mch ch c nng lng in trng.D. cm ng t trong cun dy t l nghch vi cng dng in qua cun dy.

Cu 11: Mt mch dao ng LC l tng ang c dao ng in t t do vi tn s gc . Gi q 0 l in tch cci ca mt bn t in th cng dng in cc i trong mch l

A. I0 =

0q . B. q0. C. q02. D. 20

q.

Cu 12: Mt mch dao ng LC l tng gm cun cm thun c t cm

210H mc ni tip vi t in c

in dung

1010F. Chu k dao ng in t ring ca mch ny bng

A. 4.10-6 s. B. 3.10-6 s. C. 5.10-6 s. D. 2.10-6 s.

Cu 13: Trong mt mch dao ng LC l tng gm cun cm thun c t cm L mc ni tip vi t in cin dung C ang c dao ng in t t do vi tn s f. H thc ng l

A. C =2

24

f

L. B. C =

L

f2

2

4. C. C =

Lf224

1

. D. C =

L

f224.

Cu 14: Mch dao ng in t gm cun cm thun c t cm1

mH

v t in c in dung4

nF

. Tn s

dao ng ring ca mch l :A. 55 .10 Hz B. 62,5.10 Hz C. 65 .10 Hz D. 52,5.10 Hz

Cu 15: Sng in t khi truyn t khng kh vo nc th:A. tc truyn sng v bc sng u gim. B. tc truyn sng gim, bc sng tng.C. tc truyn sng tng, bc sng gim. D. tc truyn sng v bc sng u tng.

Cu 16: Mch dao ng in t LC l tng ang hot ng. in tch ca mt bn t inA.bin thin theo hm bc nht ca thi gian B.bin thin theo hm bc hai ca thi gian

C. khng thay i theo thi gian D.bin thin iu ha theo thi gianCu 17: Sng in t v sng c hc khng c chung tnh cht no di y?A. Phn x. B. Truyn c trong chn khng.C. Mang nng lng. D. Khc x.

Cu 18: Sng in t l qu trnh lan truyn ca in t trng bin thin, trong khng gian. Khi ni v quan hgia in trng v t trng ca in t trng trn th kt lun no sau y l ng?

A. Vct cng in trng v cm ng t cng phng v cng ln.B. Ti mi im ca khng gian, in trng v t trng lun lun dao ng ngc phA.C. Ti mi im ca khng gian, in trng v t trng lun lun dao ng lch pha nhau /2.D. in trng v t trng bin thin theo thi gian vi cng chu k.

Cu 19: Pht biu no sai khi ni v sng in t?A. Sng in t l s lan truyn trong khng gian ca in t trng bin thin theo thi gian.B. Trong sng in t, in trng v t trng lun dao ng lch pha nhau /2.C. Trong sng in t, in trng v t trng bin thin theo thi gian vi cng chu k.D. Sng in t dng trong thng tin v tuyn gi l sng v tuyn.

Cu 20: Khi ni v sng in t, pht biu no di y l sai?A. Trong qu trnh truyn sng in t, vect cng in trng v vect cm ng t lun cng phng.B. Sng in t truyn c trong mi trng vt cht v trong chn khng.C. Trong chn khng, sng in t lan truyn vi vn tc bng vn tc nh sng.D. Sng in t b phn x khi gp mt phn cch gia hai mi trng.

Cu 21: i vi s lan truyn sng in t th

A. vect cng in trng E cng phng vi phng truyn sng cn vect cm ng t B vung gcvi vect cng in trng E .

B. vect cng in trng E v vect cm ng t B lun cng phng vi phng truyn sng.C. vect cng in trng E v vect cm ng t B lun vung gc vi phng truyn sng.

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D. vect cm ng t B cng phng vi phng truyn sng cn vect cng in trng E vung gcvi vect cm ng t B .

Cu 22: Trong s ca mt my pht sng v tuyn in, khng c mch (tng)A. tch sng B. khuch i C.pht dao ng cao tn D.bin iu

Cu 23: Trong mch dao ng LC l tng c dao ng in t t do thA. nng lng in trng tp trung cun cm.B. nng lng in trng v nng lng t trng lun khng i.C. nng lng t trng tp trung t in.D. nng lng in t ca mch c bo ton.

Cu 24: Khi ni v sng in t, pht biu no di y l sai?A. Sng in t b phn x khi gp mt phn cch gia hai mi trng.B. Sng in t truyn c trong mi trng vt cht v trong chn khng.C. Trong qu trnh truyn sng in t, vect cng in trng v vect cm ng t lun cng phng.D. Trong chn khng, sng in t lan truyn vi vn tc bng vn tc nh sng.

Cu 25: Mt sng in t c tn s 100 MHz truyn vi tc 3.10 8 m/s c bc sng lA. 300 m. B. 0,3 m. C. 30 m. D. 3 m.

Cu 26: Trong mch dao ng LC l tng ang c dao ng in t t do, in tch ca mt bn t in vcng dng in qua cun cm bin thin iu ha theo thi gian

A. lun ngc pha nhau. B. vi cng bin . C. lun cng pha nhau. D. vi cng tn s.Cu 27: Mt mch dao ng in t LC l tng gm cun cm thun c t cm 5H v t in c indung 5F. Trong mch c dao ng in t t do. Khong thi gian gia hai ln lin tip m in tch trn mt

bn t in c ln cc i lA. 5 . 610 s. B. 2,5 . 610 s. C. 10 . 610 s. D. 610 s.

Cu 28: Khi ni v dao ng in t trong mch dao ng LC l tng, pht biu no sau y sai?A. Cng dng in qua cun cm v hiu in th gia hai bn t in bin thin iu ha theo thi gian

vi cng tn s.B.Nng lng in t ca mch gm nng lng t trng v nng lng in trng.C. in tch ca mt bn t in v cng dng in trong mch bin thin iu ha theo thi gian lch

pha nhau2

D.Nng lng t trng v nng lng in trng ca mch lun cng tng hoc lun cng gim.

Cu 29: Pht biu no sau y l sai khi ni v sng in t?A. Sng in t l sng ngang.B. Khi sng in t lan truyn, vect cng in trng lun vung gc vi vect cm ng t.C. Khi sng in t lan truyn, vect cng in trng lun cng phng vi vect cm ng t.D. Sng in t lan truyn c trong chn khng.

Cu 30: Sng in tA. l sng dc hoc sng ngang. B. l in t trng lan truyn trong khng gian.

C. c thnh phn in trng v thnh phn t trng ti mt im dao ng cng phng.D. khng truyn c trong chn khng.

Cu 31: Trong s khi ca mt my pht thanh dng v tuyn khngc b phn no di y?A. Mch tch sng. B. Mch khuych i. C. Mch bin iu. D. Anten.

Cu 32: Pht biu no sau y l sai khi ni v sng in t?A. Khi sng in t gp mt phn cch gia hai mi trng th n c th b phn x v khc x.B. Sng in t truyn c trong chn khng.C. Sng in t l sng ngang nn n ch truyn c trong cht rn.D. Trong sng in t th dao ng ca in trng v ca t trng ti mt im lun ng pha vi nhau.

Cu 33: Khi ni v in t trng, pht biu no sau y sai?

A.Nu ti mt ni c t trng bin thin theo thi gian th ti xut hin in trng xoy.B. Trong qu trnh lan truyn in t trng, vect cng in trng v vect cm ng t ti mt im

lun vung gc vi nhau.C. in trng v t trng l hai mt th hin khc nhau ca mt trng duy nht gi l in t trng.D. in t trng khng lan truyn c trong in mi.

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Cu 34: Mch chn sng ca mt my thu sng v tuyn gm cun cm thun c t cm0,4

H v t in c

in dung C thay i C. iu chnh C =10

9pF th mch ny thu c sng in t c bc sng bng

A. 100m. B. 400m. C. 200m. D. 300m.

Cu 35: Khi cho nh sng n sc truyn t mi trng trong sut ny sang mi trng trong sut khc thA. tn s khng i v vn tc khng i B. tn s thay i v vn tc thay iC. tn s thay i v vn tc thay i D. tn s khng i v vn tc thay i

Cu 36: Nguyn tc hot ng ca my quang ph da trn hin tngA.phn x nh sng B. giao thoa nh sng C. tn sc nh sng D. khc x nh sng

Cu 37: Trong th nghim Ing v giao thoa nh sng, khong cch gia hai khe a = 0,3mm, khang cch t mtphng cha hai khe n mn quan st D = 2m. Hai khe c chiu bng nh sng trng. Khong cch t vn sngbc 1 mu ( = 0,76m) n vn sng bc 1 mu tm ( t = 0,4m ) cng mt pha ca vn trung tm l

A. 1,8mm B. 1,5mm C. 2,7mm D. 2,4mm

Cu 38: Trong th nghim Ing v giao thoa nh sng, khong cch gia hai khe l a, khong cch t mt phngcha hai khe n mn quan st l D, khong vn i. Bc sng nh sng chiu vo hai khe l

A. = D/(ai) B. = (iD)/a C. = (aD)/i D. = (ai)/D

Cu 39: Mt sng nh sng n sc c tn s f1 , khi truyn trong mi trng c chit sut tuyt i n1 th c vntc v1 v c bc sng 1. Khi nh sng truyn trong mi trng c chit sut tuyt i n2 (n2 n1) th c vntc v2, c bc sng 2 v tn s f2 . H thc no sau y l ng?

A. f2 = f1 . B. v2. f2 = v1. f1 . C. v2 = v1. D. 2 = 1.Cu 40: Trong th nghim giao thoa nh sng ca Ing (Young), khong cch gia hai khe l 1 mm, khong ccht mt phng cha hai khe n mn quan st l 2 m. Chiu sng hai khe bng nh sng

n sc c bc sng . Trn mn quan st thu c hnh nh giao thoa c khong vn i = 1,2 mm.

Gi tr ca bngA. 0,45 m. B. 0,60 m. C. 0,65 m. D. 0,75 m.

Cu 41: nh sng c tn s ln nht trong s cc nh sng n sc: , lam, chm, tm l nh sngA. lam. B. chm. C. tm. D. .

Cu 42: Pht biu no sau y sai?A. Sng nh sng l sng ngang.B. Cc cht rn, lng v kh p sut ln khi b nung nng pht ra quang ph vch.C. Tia hng ngoi v tia t ngoi u l sng in t.D. Ria Rn-ghen v tia gamma u khng thuc vng nh sng nhn thy.

Cu 43: Trong th nghim Y-ng v giao thoa nh sng, khong cch gia hai khe l 1mm, khong cch t mtphng cha hai khe n mn quan st l 2m, bc sng ca nh sng n sc chiu n hai khe l 0,55m. Hvn trn mn c khong vn l

A. 1,2mm. B. 1,0mm. C. 1,3mm. D. 1,1mm.

Cu 44: Tia hng ngoi

A. khng truyn c trong chn khng. B. l nh sng nhn thy, c mu hng.C. khng phi l sng in t. D. c ng dng si m.

Cu 45: Pht biu no sau y sai?A. Trong chn khng, mi nh sng n sc c mt bc sng xc nh.B. Trong chn khng, cc nh sng n sc khc nhau truyn vi cng tc .C. Trong chn khng, bc sng ca nh sng nh hn bc sng ca nh sng tm.D. Trong nh sng trng c v s nh sng n sc.

Cu 46: Trong chn khng, bc sng ca mt nh sng mu lc lA. 0,55nm. B. 0,55mm. C. 0,55m. D. 0,55pm.

Cu 47: Khi chiu mt nh sng kch thch vo mt cht lng th cht lng ny pht nh sng hunh quang mu

vng. nh sng kch thch khng th l nh sngA. mu . B. mu chm. C. mu lam. D. mu tm.

Cu 48: Khi ni v tia hng ngoi v tia t ngoi, pht biu no sau y l ng?A. Tia hng ngoi v tia t ngoi u c kh nng ion ha cht kh nh nhau.B.Ngun pht ra tia t ngoi th khng th pht ra tia hng ngoi.

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C. Tia hng ngoi gy ra hin tng quang in cn tia t ngoi th khng.D. Tia hng ngoi v tia t ngoi u l nhng bc x khng nhn thy.

Cu 49: Tia Rn-ghen (tia X) c bc sngA. nh hn bc sng ca tia hng ngoi. B. nh hn bc sng ca tia gamma.C. ln hn bc sng ca tia mu . D. ln hn bc sng ca tia mu tm.

Cu 50: Tia t ngoiA. c kh nng m xuyn mnh hn tia gamma B. c tn s tng khi truyn t khng kh vo ncC. khng truyn c trong chn khng. D. c ng dng kh trng, dit khun.

Cu 51: Trong th nghim Y-ng v giao thoa nh sng, khong cch gia hai khe hp l 1 mm, khong cch tmt phng cha hai khe n mn quan st l 2 m. nh sng chiu vo hai khe c bc sng 0,5 m. Khong ccht vn sng trung tm n vn sng bc 4 l

A. 4 mm. B. 2,8 mm. C. 2 mm. D. 3,6 mm.

Cu 52: Khi ni v quang ph vch pht x, pht biu no sau y l sai?A. Quang ph vch pht x ca mt nguyn t l mt h thng nhng vch sng ring l, ngn cch nhau bng

nhng khong ti.B. Trong quang ph vch pht x ca hir, vng nh sng nhn thy c bn vch c trng l vch , vch lam,

vch chm v vch tm.C. Quang ph vch pht x do cht rn v cht lng pht ra khi b nung nng.

D. Quang ph vch pht x ca cc nguyn t ha hc khc nhau th khc nhau.Cu 53: Chiu mt chm sng n sc hp ti mt bn ca mt lng knh thy tinh t trong khng kh. Khi iqua lng knh, chm sng ny

A. khng b lch phng truyn B.b thay i tn s C. khng b tn sc D.b i mu

Cu 54: Khi nghin cu quang ph ca cc cht, cht no di y khi b nung nng n nhit cao th khngpht ra quang ph lin tc?

A. Cht kh p sut ln. B. Cht kh p sut thp. C. Cht lng. D. Cht rn.

Cu 55: Hin tng nhiu x v giao thoa nh sng chng t nh sngA. c tnh cht ht. B. l sng dc. C. c tnh cht sng. D. lun truyn thng.

Cu 56: Trong th nghim Y-ng v giao thoa nh sng, ngi ta dng nh sng n sc c bc sng 600 nm,

khong cch gia hai khe l 1,5mm, khong cch t mt phng cha hai khe n mn quan st l 3 m. Trn mn,khong cch gia hai vn sng bc 5 hai pha ca vn sng trung tm l

A. 9,6 mm. B. 24,0 mm. C. 6,0 mm. D. 12,0 mm.

Cu 57: Trong th nghim Ing (Y-ng) v giao thoa nh sng, hai khe hp cch nhau mt khong a = 0,5 mm,khong cch t mt phng cha hai khe n mn quan st l D = 1,5 m. Hai khe c chiu bng bc x c bcsng = 0,6 m. Trn mn thu c hnh nh giao thoA. Ti im M trn mn cch vn sng trung tm (chnhgia) mt khong 5,4 mm c vn sng bc (th)

A. 3. B. 6. C. 2. D. 4.

Cu 58: Quang ph lin tc ca mt ngun sng JA.ph thuc vo c thnh phn cu to v nhit ca ngun sng J.

B. khng ph thuc vo c thnh phn cu to v nhit ca ngun sng J.C. khng ph thuc thnh phn cu to ca ngun sng J, m ch ph thuc vo nhit ca ngun sng .D. khng ph thuc vo nhit ca ngun sng J, m ch ph thuc thnh phn cu to ca ngun sng .

Cu 59: Tia hng ngoi v tia Rnghen u c bn cht l sng in t, c bc sng di ngn khc nhau nnA. chng b lch khc nhau trong t trng u.B. c kh nng m xuyn khc nhau.C. chng b lch khc nhau trong in trng u.D. chng u c s dng trong y t chp X-quang (chp in).

Cu 60: Trong cc pht biu sau y, pht biu no l sai?A. nh sng trng l tng hp (hn hp) ca nhiu nh sng n sc c mu bin thin lin tc t ti tm.B. nh sng n sc l nh sng khng b tn sc khi i qua lng knh.C. Hin tng chm sng trng, khi i qua mt lng knh, b tch ra thnh nhiu chm sng c mu sc khc

nhau l hin tng tn sc nh sng.D. nh sng do Mt Tri pht ra l nh sng n sc v n c mu trng.

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Cu 61: Mt di sng in t trong chn khng c tn s t 4,0.10 14 Hz n 7,5.1014 Hz. Bit vn tc nh sngtrong chn khng c = 3.108 m/s. Di sng trn thuc vng no trong thang sng in t?

A. Vng tia Rnghen. B. Vng tia t ngoi.C. Vng nh sng nhn thy. D. Vng tia hng ngoi.

Cu 62: Cc bc x c bc sng trong khong t 3.10 -9m n 3.10-7m lA. tia t ngoi. B. nh sng nhn thy. C. tia hng ngoi. D. tia Rnghen.

Cu 63: Trong th nghim Ing (Y-ng) v giao thoa ca nh sng n sc, hai khe hp cch nhau 1 mm, mtphng cha hai khe cch mn quan st 1,5 m. Khong cch gia 5 vn sng lin tip l 3,6 mm. Bc sng ca

nh sng dng trong th nghim ny bngA. 0,48 m. B. 0,40 m. C. 0,60 m. D. 0,76 m.

Cu 64: Trong mt th nghim Ing (Y-ng) v giao thoa nh sng vi nh sng n sc c bc sng 1 = 540nm th thu c h vn giao thoa trn mn quan st c khong vn i1 = 0,36 mm. Khi thay nh sng trn bng nhsng n sc c bc sng 2 = 600 nm th thu c h vn giao thoa trn mn quan st c khong vn

A. i2 = 0,60 mm. B. i2 = 0,40 mm. C. i2 = 0,50 mm. D. i2 = 0,45 mm.

Cu 65: Trong th nghim Ing (Y-ng) v giao thoa nh sng vi nh sng n sC. Bit khong cch gia haikhe hp l 1,2 mm v khong cch t mt phng cha hai khe hp n mn quan st l 0,9 m. Quan st c hvn giao thoa trn mn vi khong cch gia 9 vn sng lin tip l 3,6 mm. Bc sng ca nh sng dng trongth nghim l

A. 0,50.10-6

m. B. 0,55.10-6

m. C. 0,45.10-6

m. D. 0,60.10-6

m.Cu 66: nh sng n sc c tn s 5.1014 Hz truyn trong chn khng vi bc sng 600 nm. Chit sut tuyti ca mt mi trng trong sut ng vi nh sng ny l 1,52. Tn s ca nh sng trn khi truyn trong mitrng trong sut ny

A. nh hn 5.1014 Hz cn bc sng bng 600 nm.B. ln hn 5.1014 Hz cn bc sng nh hn 600 nm.C. vn bng 5.1014 Hz cn bc sng nh hn 600 nm.D. vn bng 5.1014 Hz cn bc sng ln hn 600 nm.

Cu 67: Tia hng ngoi l nhng bc x cA.bn cht l sng in t. B. kh nng ion ho mnh khng kh.

C. kh nng m xuyn mnh, c th xuyn qua lp ch dy c cm.D.bc sng nh hn bc sng ca nh sng .

Cu 68: Khi ni v tia t ngoi, pht biu no di y l sai?A. Tia t ngoi c tc dng mnh ln knh nh. B. Tia t ngoi c bn cht l sng in t.C. Tia t ngoi c bc sng ln hn bc sng ca nh sng tm.D. Tia t ngoi b thu tinh hp th mnh v lm ion ho khng kh.

Cu 69: Tia Rnghen cA. cng bn cht vi sng m. B.bc sng ln hn bc sng ca tia hng ngoi.C. cng bn cht vi sng v tuyn. D. in tch m.

Cu 70: Pht biu no sau y l sai khi ni v nh sng n sc?A. Chit sut ca mt mi trng trong sut i vi nh sng ln hn chit sut ca mi trng i vi

nh sng tm.B. nh sng n sc l nh sng khng b tn sc khi i qua lng knh.C. Trong cng mt mi trng truyn, vn tc nh sng tm nh hn vn tc nh sng .D. Trong chn khng, cc nh sng n sc khc nhau truyn i vi cng vn tc.

Cu 71: Pht biu no sau y l ng khi ni v quang ph?A. Quang ph lin tc ca ngun sng no th ph thuc thnh phn cu to ca ngun sng y.B. Mi nguyn t ha hc trng thi kh hay hi nng sng di p sut thp cho mt quang ph vch ring,

c trng cho nguyn t .C. thu c quang ph hp th th nhit ca m kh hay hi hp th phi cao hn nhit ca ngun

sng pht ra quang ph lin tc.

D. Quang ph hp th l quang ph ca nh sng do mt vt rn pht ra khi vt c nung nng.Cu 72: Khi ni v quang ph, pht biuno sau y l ng?

A. Cc cht rn b nung nng th pht ra quang ph vch.B. Mi nguyn t ha hc c mt quang ph vch c trng ca nguyn t y.C. Cc cht kh p sut ln b nung nng th pht ra quang ph vch.

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D. Quang ph lin tc ca nguyn t no th c trng cho nguyn t .

Cu 73: Trong th nghim Y-ng v giao thoa vi nh sng n sc, khong cch gia hai khe l 1 mm, khongcch t mt phng cha hai khe n mn quan st l 2m v khong vn l 0,8 mm. Cho c = 3.10 8 m/s. Tn s nhsng n sc dng trong th nghim l

A. 5,5.1014 Hz. B. 4,5. 1014 Hz. C. 7,5.1014 Hz. D. 6,5. 1014 Hz.

Cu 74: Trong th nghim Y-ng v giao thoa nh sng, khong cch gia hai khe l 0,5 mm, khong cch t mtphng cha hai khe n mn l 2 m. nh sng n sc dng trong th nghim c bc sng 0,5 m. Vng giaothoa trn mn rng 26 mm (vn trung tm chnh gia). S vn sng l

A. 15. B. 17. C. 13. D. 11.Cu 75: Trong th nghim Y-ng v giao thoa nh sng, ngun sng gm cc bc x c bc sng ln lt l 1 =750 nm, 2 = 675 nm v 3 = 600 nm. Ti im M trong vng giao tha trn mn m hiu khong cch n haikhe bng 1,5 m c vn sng ca bc x

A. 2 v 3. B. 3. C. 1. D. 2.Cu 76: Trong th nghim Y-ng v giao thoa vi ngun sng n sc, h vn trn mn c khong vn i. Nukhong cch gia hai khe cn mt na v khong cch t hai khe n mn gp i so vi ban u th khong vngiao thoa trn mn

A. gim i bn ln. B. khng i. C. tng ln hai ln. D. tng ln bn ln.

Cu 77: Trong th nghim Y-ng v giao thoa vi nh sng n sc, khong cch gia hai khe l 1mm, khongcch t mt phng cha hai khe n mn l 2m. Trong h vn trn mn, vn sng bc 3 cch vn trung tm 2,4mm. Bc sng ca nh sng n sc dng trong th nghim l

A. 0,5 m. B. 0,7 m. C. 0,4 m. D. 0,6 m.Cu 78: Pht biu no sau y l ng?

A. nh sng n sc l nh sng b tn sc khi i qua lng knh.B. nh sng trng l hn hp ca v s nh sng n sc c mu bin thin lin tc t n tm.C. Ch c nh sng trng mi b tn sc khi truyn qua lng knh.D. Tng hp cc nh sng n sc s lun c nh sng trng.

Cu 79: Pht biu no sau y l ng ?A. Cht kh hay hi p sut thp c kch thch bng nhit hay bng in cho quang ph lin tc.B. Cht kh hay hi c kch thch bng nhit hay bng in lun cho quang ph vch.C. Quang ph lin tc ca nguyn t no th c trng cho nguyn t y.D. Quang ph vch ca nguyn t no th c trng cho nguyn t y.

Cu 80: Trong chn khng, cc bc x c sp xp theo th t bc sng gim dn l:A. tia hng ngoi, nh sng tm, tia t ngoi, tia Rn-ghen.B. tia hng ngoi, nh sng tm, tia Rn-ghen, tia t ngoi.C. nh sng tm, tia hng ngoi, tia t ngoi, tia Rn-ghen.D. tia Rn-ghen, tia t ngoi, nh sng tm, tia hng ngoi.

Cu 81: Khi ni v tia hng ngoi, pht biu no sau y l sai?A. Tia hng ngoi c bn cht l sng in t.

B. Cc vt nhit trn 20000C ch pht ra tia hng ngoi.C. Tia hng ngoi c tn s nh hn tn s ca nh sng tm.D. Tc dng ni bt ca tia hng ngoi l tc dng nhit.

Cu 82: Trong th nghim Y-ng v giao thoa nh sng, hai khe c chiu bng nh sng n sc c bc sng 0,6m. Khong cch gia hai khe l 1 mm, khong cch t mt phng cha hai khe n mn quan st l 2,5 m, brng min giao thoa l 1,25 cm. Tng s vn sng v vn ti c trong min giao thoa l

A. 21 vn. B. 15 vn. C. 17 vn. D. 19 vn.

Cu 83: Tia t ngoi c dngA. tm vt nt trn b mt sn phm bng kim loi. B. trong y t chp in, chiu in.C. chp nh b mt Tri t t v tinh. D. tm khuyt tt bn trong sn phm bng kim loi.

Cu 84: Quang ph vch pht xA. ca cc nguyn t khc nhau, cng mt nhit th nh nhau v sng t i ca cc vch.B. l mt h thng nhng vch sng (vch mu) ring l, ngn cch nhau bi nhng khong ti.C. do cc cht rn, cht lng hoc cht kh c p sut ln pht ra khi b nung nng.D. l mt di c mu t n tm ni lin nhau mt cch lin tc.

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Cu 85: Khi ni v tia hng ngoi, pht biu no di y l sai?A. Tia hng ngoi cng c th bin iu c nh sng in t cao tn.B. Tia hng ngoi c kh nng gy ra mt s phn ng ha hc.C. Tia hng ngoi c tn s ln hn tn s ca nh sng .D. Tc dng ni bt nht ca tia hng ngoi l tc dng nhit.

Cu 86: Trong cc loi tia: Rn-ghen, hng ngoi, t ngoi, n sc mu lc; tia c tn s nh nht lA. tia t ngoi. B. tia hng ngoi. C. tia n sc mu lc. D. tia Rn-ghen.

Cu 87: Trong cc ngun bc x ang hot ng: h quang in, mn hnh my v tuyn, l si in, l vi

sng; ngun pht ra tia t ngoi mnh nht lA. mn hnh my v tuyn. B. l vi sng. C. l si in. D. h quang in.

Cu 88: Khi ni v nh sng n sc, pht biu no sau y ng?A. Trong thy tinh, cc nh sng n sc khc nhau truyn vi tc nh nhau.B. nh sng n sc khng b tn sc khi truyn qua lng knh.C. nh sng trng l nh sng n sc v n c mu trng.D. Tc truyn ca mt nh sng n sc trong nc v trong khng kh l nh nhau.

Cu 89: Khi ni v tia t ngoi, pht biu no sau y sai?A. Trong cng nghip, tia t ngoi c dng pht hin cc vt nt trn b mt cc sn phm kim loi.B. Tia t ngoi l sng in t c tn s nh hn tn s ca nh sng tm.

C. Trong y hc, tia t ngoi c dng cha bnh ci xng.D. Tia t ngoi c tc dng mnh ln phim nh.

Cu 90: Chit xut ca mt thy tinh i vi mt nh sng n sc l 1,6852. Tc ca nh sng ny trongthy tinh l:

A. 1,59.108 m/s B. 1,87.108 m/s C. 1,67.108 m/s D. 1,78.108m/sCu 91: Trong nguyn t hir, khi lectron chuyn t qu o N v qu o L s pht ra vch quang ph

H (tm) B. H (lam) C. H(chm) D. H ()

Cu 92: Ln lt chiu hai bc x c bc sng 1 = 0,75 m , 2 = 0,25m vo mt tm km c gii hnquang in 0 = 0,35 m . Bc x no gy ra hin tng quang in?

A. Ch c bc x 1 B. Khng c bc x no trong hai bc x trn

C. Ch c bc x 2 D. C hai bc xCu 93: Cng that lectron ra khi mt kim lai A = 6,625.10 -19J, hng s Plng h = 6,625.10-34J.s, vn tc nhsng trong chn khng c = 3.108m/s. Gii hn quang in ca kim lai l

A. 0,295 m B. 0,300 m C. 0,250 m D. 0,375 m

Cu 94: Vi 1, 2, 3 ln lt l nng lng ca phtn ng vi cc bc x mu vng, bc x t ngoi v bcx hng ngoi th

A. 2 > 1 > 3. B. 3 > 1 > 2. C. 1 > 2 > 3. D. 2 > 3 > 1.

Cu 95: Gii hn quang in ca ng (Cu) l 0 = 0,30 m. Bit hng s Plng h = 6,625.10-34 J.s v vn tctruyn nh sng trong chn khng c = 3.108 m/s. Cng thot ca lectrn khi b mt ca ng l

A. 6,625.10-19 J. B. 6,265.10-19 J. C. 8,526.10-19 J. D. 8,625.10-19 J.

Cu 96: Trong hin tng quang in, vn tc ban u ca cc lectrn quang in b bt ra khi b mt kim loiA. c hng lun vung gc vi b mt kim loi.B. c gi tr ph thuc vo cng ca nh sng chiu vo kim loi .C. c gi tr t 0 n mt gi tr cc i xc nh.D. c gi tr khng ph thuc vo bc sng ca nh sng chiu vo kim loi .

Cu 97: Vi f1, f2, f3 ln lt l tn s ca tia hng ngoi, tia t ngoi v tia gamma (tia ) thA. f1 > f3 > f2. B. f2 > f1 > f3. C. f3 > f1 > f2. D. f3 > f2 > f1

Cu 98: Trong quang ph vch pht x ca nguyn t hir (H), dy Banme cA. tt c cc vch u nm trong vng hng ngoi.B. tt c cc vch u nm trong vng t ngoi.

C.bn vch thuc vng nh sng nhn thy l H, H, H, H, cc vch cn li thuc vng t ngoi.D.bn vch thuc vng nh sng nhn thy l H, H, H, H, cc vch cn li thuc vng hng ngoi.

Cu 99: Pin quang in l ngun in trong A. nhit nng c bin i thnh in nng. B. ha nng c bin i thnh in nng.C. c nng c bin i thnh in nng. D. quang nng c bin i thnh in nng.

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Cu 100: Pin quang in l ngun in hot ng da trn hin tngA. hunh quang. B. tn sc nh sng. C. quang pht quang. D. quang in trong.

Cu 101: Quang in tr c ch to tA. kim loi v c c im l in tr sut ca n gim khi c nh sng thch hp chiu vo.B. cht bn dn v c c im l dn in km khi khng b chiu sng v tr nn dn in tt khi c chiu

sng thch hp.C. cht bn dn v c c im l dn in tt khi khng b chiu sng v tr nn dn in km c chiu

sng thch hp.

D. kim loi v c c im l in tr sut ca n tng khi c nh sng thch hp chiu vo.Cu 102: Cng thot ca lectron khi ng l 6,625.10-19J. Bit hng s Plng l 6,625.10-34J.s, tc nh sngtrong chn khng l 3.108m/s. Gii hn quang in ca ng l

A. 0,3m. B. 0,90m. C. 0,40m. D. 0,60m.

Cu 103: Chiu mt chm bc x c bc sng vo b mt mt tm nhm c gii hn quang in 0,36m.Hin tng quang in khng xy ra nu bng

A. 0,24 m. B. 0,42 m. C. 0,30 m. D. 0,28 m.

Cu 104: Pht biu no sau y sai khi ni v phtn nh sng?A.Nng lng ca phtn nh sng tm ln hn nng lng ca phtn nh sng .B. Phtn ch tn ti trong trng thi chuyn ng.

C. Mi phtn c mt nng lng xc nh.D.Nng lng ca cc phtn ca cc nh sng n sc khc nhau u bng nhau.

Cu 105: Khi ni v phtn, pht biu no di y l ng?A. Vi mi nh sng n sc c tn s f, cc phtn u mang nng lng nh nhau.B.Nng lng ca phtn cng ln khi bc sng nh sng ng vi phtn cng ln.C.Nng lng ca phtn nh sng tm nh hn nng lng ca phtn nh sng .D. Phtn c th tn ti trong trng thi ng yn.

Cu 106: Bit hng s Plng l 6,625.10-34 Js, tc nh sng trong chn khng l 3.108 m/s. Nng lng caphtn ng vi bc x c bc sng 0,6625 m l

A. 3.10 -18 J. B. 3.10 -20 J. C. 3.10 -17 J. D. 3.10 -19 J.

Cu 107: Gii hn quang in ca mt kim loi l 0,75 m. Bit hng s Plng h = 6,625.10-34

J.s, tc nhsng trong chn khng c = 3.108m/s. Cng thot lectron khi kim loi ny lA. 2,65.10-19 J. B. 2,65.10-32 J. C. 26,5.10-32 J. D. 26,5.10-19 J.

Cu 108: Quang in tr hot ng da vo hin tngA. quang - pht quang. B. quang in trong. C.pht x cm ng. D. nhit in.

Cu 109: Catt ca mt t bo quang in lm bng kim loi c gii hn quang in 0. Chiu vo catt nh sngc bc sng < 0. Bit hng s Plng l h, tc nh sng trong chn khng l C. ng nng ban u cc ica cc electron quang in c xc nh bi cng thc:

A. Wmax =h

c

0

11

.B. Wmax =

h

c

+

0

11

.C. Wmax = hc

+

0

11

. D. Wmax = hc

0

11

.

Cu 110: Bit cng thot ca lectron khi mt kim loi l 4,14 eV. Gii hn quang in ca kim loi lA. 0,50 m. B. 0,26 m. C. 0,30 m. D. 0,35 m.

Cu 111: Theo thuyt lng t nh sng ca Anh-xtanh, phtn ng vi mi nh sng n sc c nng lngcng ln nu nh sng n sc c

A. tn s cng ln. B. tc truyn cng ln.C.bc sng cng ln. D. chu k cng ln.

Cu 112: Trong nguyn t hidro, vi r0 l bn knh B0 th bn knh qu o dng ca lectron khng th l:A. 12r0 B. 25r0 C. 9r0 D. 16r0

Cu 113: C bn bc x: nh sng nhn thy, tia hng ngoi, tia X v tia . Cc bc x ny c sp xp theothc t bc sng tng dn l :

A. tia X, nh sng nhn thy, tia , tia hng ngoi. B. tia ,tia X, tia hng ngoi, nh sng nhn thy.C. tia , tia X, nh sng nhn thy, tia hng ngoi D. tia , nh sng nhn thy, tia X, tia hng ngoi.

Cu 114: Trong chn khng, nh sng tm c bc sng 0,4 m. Mi phtn ca nh sng ny mang nng lngxp x bng

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A. 4,97.10-31 J B. 4,97.10-19 J C. 2,49.10-19 J D. 2,49.10-31 J

Cu 115: Chiu bc x c bc sng 0,18 m vo mt tm kim loi c gii hn quang in l 0,30 m. Vn tcban u cc i ca quang lectron l

A. 4,85.106 m/s B. 4,85.105 m/s C. 9,85.105 m/s D. 9,85.106 m/s

Cu 116: Trong quang ph vch pht x ca nguyn t hidro, dy Pa-sen gm:A. Cc vch trong min hng ngoi B. Cc vch trong min nh sng nhn thyC. Cc vch trong min t ngoi v mt s vch trong min nh sng nhn thyD. Cc vch trong min t ngoi.

Cu 117: Cng thot lectrn (lectron) ra khi mt kim loi l A = 1,88 eV. Bit hng s Plng h = 6,625.10-34

J.s, vn tc nh sng trong chn khng c = 3.108 m/s v 1 eV = 1,6.10-19 J . Gii hn quang in ca kim loi lA. 0,33 m. B. 0,22 m. C. 0,66. 10-19 m. D. 0,66 m.

Cu 118: Cho: 1eV = 1,6.10-19 J; h = 6,625.10-34 J.s; c = 3.108 m/s. Khi lectrn (lectron) trong nguyn t hirchuyn t qu o dng c nng lng Em = - 0,85eV sang qu o dng c nng lng En = - 13,60eV thnguyn t pht bc x in t c bc sng

A. 0,4340 m. B. 0,4860 m. C. 0,0974 m. D. 0,6563 m.

Cu 119: Ni dung ch yu ca thuyt lng t trc tip ni vA. s hnh thnh cc vch quang ph ca nguyn t. B. s tn ti cc trng thi dng ca nguyn t hir.C. cu to ca cc nguyn t, phn t. D. s pht x v hp th nh sng ca nguyn t, phn t

Cu 120: Bit hng s Plng h = 6,625.10 -34 J.s v ln ca in tch nguyn t l 1,6.10 -19C. Khi nguyn thir chuyn t trng thi dng c nng lng -1,514 eV sang trng thi dng c nng lng -3,407 eV thnguyn t pht ra bc x c tn s

A. 2,571.1013 Hz. B. 4,572.1014Hz. C. 3,879.1014 Hz. D. 6,542.1012 Hz.

Cu 121: Theo thuyt lng t nh sng th nng lng caA. mt phtn bng nng lng ngh ca mt lectrn (lectron).B. mt phtn ph thuc vo khong cch t phtn ti ngun pht ra n.C. cc phtn trong chm sng n sc bng nhauD. mt phtn t l thun vi bc sng nh sng tng ng vi phtn .

Cu 122: Trong nguyn t hir , bn knh Bo l r0 = 5,3.10-11m. Bn knh qu o dng N l

A. 47,7.10-11m. B. 21,2.10-11m. C. 84,8.10-11m. D. 132,5.10-11m.Cu 123: Cng sut bc x ca Mt Tri l 3,9.1026 W. Nng lng Mt Tri ta ra trong mt ngy l

A. 3,3696.1030 J. B. 3,3696.1029 J. C. 3,3696.1032 J. D. 3,3696.1031 J.Cu 124: Trong chn khng, bc x n sc vng c bc sng l 0,589 m. Ly h = 6,625.10-34J.s; c=3.108 m/sv e = 1,6.10-19c;Nng lng ca phtn ng vi bc x ny c gi tr l

A. 2,11 eV. C. 4,22 eV. C. 0,42 eV. D. 0,21 eV.

Cu 125: Dng thuyt lng t nh sng khng gii thch cA. hin tng quang pht quang. B. hin tng giao thoa nh sng.C. nguyn tc hot ng ca pin quang in. D. hin tng quang in ngoi.

Cu 126: Gi nng lng ca phtn nh sng , nh sng lc v nh sng tm ln lt l , L v T thA. T > L > e. B. T > > eL. C. > L > eT. D. L > T > e.

Cu 127: i vi nguyn t hir, cc mc nng lng ng vi cc qu o dng K, M c gi tr ln lt l:-13,6 eV; -1,51 eV. Cho h = 6,625.10 -34 J.s; c = 3.108 m/s v e = 1,6.10-19C. Khi lectron chuyn t qu o dngM v qu o dng K, th nguyn t hir c th pht ra bc x c bc sng

A. 102,7 m. B. 102,7 mm. C. 102,7 nm. D. 102,7 pm.Cu 128: Khi chiu vo mt cht lng nh sng chm th nh sng hunh quang pht ra khng th l

A. nh sng tm. B. nh sng vng. C. nh sng . D. nh sng lc.

Cu 129: Nguyn t hit trng thi c bn c mc nng lng bng -13,6 eV. chuyn ln trng thi dngc mc nng lng -3,4 eV th nguyn t hir phi hp th mt phtn c nng lng

A. 10,2 eV. B. -10,2 eV. C. 17 eV. D. 4 eV.

Cu 130: Mt m nguyn t hir ang trng thi kch thch m lectron chuyn ng trn qu o dng N.Khi lectron chuyn v cc qu o dng bn trong th quang ph vch pht x ca m nguyn t c baonhiu vch?

A. 3. B. 1. C. 6. D. 4.

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Cu 131: Cng thot lectron ca mt kim loi l 7,64.10-19J. Chiu ln lt vo b mt tm kim loi ny cc bcx c bc sng l 1 = 0,18 m, 2 = 0,21 m v 3 = 0,35 m. Ly h=6,625.10-34 J.s, c = 3.108 m/s. Bc x nogy c hin tng quang in i vi kim loi ?

A. Hai bc x (1 v 2). B. Khng c bc x no trong ba bc x trn.C. C ba bc x (1, 2 v 3). D. Ch c bc x 1.

Cu 132: Pin quang in l ngun in, trong A. ha nng c bin i trc tip thnh in nng. B. quang nng c bin i trc tip thnh in nng.C. c nng c bin i trc tip thnh in nng. D. nhit nng c bin i trc tip thnh in nng.

Cu 133: i vi nguyn t hir, khi lectron chuyn t qu o M v qu o K th nguyn t pht ra phtnc bc sng 0,1026 m. Ly h = 6,625.10 -34J.s, e = 1,6.10-19 C v c = 3.108m/s. Nng lng ca phtn ny bng

A. 1,21 eV B. 11,2 eV. C. 12,1 eV. D. 121 eV.

Cu 134: Mt cht c kh nng pht ra nh sng pht quang vi tn s f = 6.1014 Hz. Khi dng nh sng c bcsng no di y kch thch th cht ny khng thpht quang?

A. 0,55 m. B. 0,45 m. C. 0,38 m. D. 0,40 m.

Cu 135: Theo mu nguyn t Bo, bn knh qu o K ca lectron trong nguyn t hir l r0. Khi lectronchuyn t qu o N v qu o L th bn knh qu o gim bt

A. 12r0. B. 4r0. C. 9r0. D. 16r0.

Cu 136: Mt kim loi c cng thot lectron l 7,2.10 -19 J. Chiu ln lt vo kim loi ny cc bc x c bcsng 1= 0,18 m, 2= 0,21 m, 3= 0,32 m v = 0,35 m. Nhng bc x c th gy ra hin tng quangin kim loi ny c bc sng l

A. 1, 2 v 3. B. 1 v 2. C. 2, 3 v 4. D. 3 v 4.

Cu 137: Khi chiu chm tia t ngoi vo mt ng nghim ng dung dch fluorexin th thy dung dch nypht ra nh sng mu lC. l hin tng

A.phn x nh sng. B. quang - pht quang. C. ha - pht quang. D. tn sc nh sng.

Cu 138: Theo thuyt lng t nh sng, pht biu no di y l sai?A. nh sng c to thnh bi cc ht gi l phtn.B.Nng lng ca cc phtn nh sng l nh nhau, khng ph thuc tn s ca nh sng.C. Trong chn khng, cc phtn bay dc theo tia sng vi tc c = 3.108 m/s.

D. Phn t, nguyn t pht x hay hp th nh sng, cng c ngha l chng pht x hay hp th phtn.Cu 139: Nguyn t hir chuyn t trng thi dng c nng lng En = -1,5 eV sang trng thi dng cnng lng Em = -3,4 eV. Bc sng ca bc x m nguyn t hir pht ra xp x bng

A. 0,654.10-7m. B. 0,654.10-6m. C. 0,654.10-5m. D. 0,654.10-4m.

Cu 140: Nguyn tc hot ng ca quang in tr da voA. hin tng tn sc nh sng. B. hin tng quang in ngoi.C. hin tng quang in trong. D. hin tng pht quang ca cht rn.

Cu 141: Trong nguyn t hir, bn knh Bo l r0 = 5,3.10-11m. mt trng thi kch thch ca nguyn t hir,lectron chuyn ng trn qu o dng c bn knh l r = 2,12.10 -10m. Qu o c tn gi l qu o dng

A. L. B. O. C.N. D. M.

Cu 142: Hin tng quang in ngoi l hin tng lectron b bt ra khi tm kim loi khiA. chiu vo tm kim loi ny mt chm ht nhn heli.B. chiu vo tm kim loi ny mt bc x in t c bc sng thch hp.C. cho dng in chy qua tm kim loi ny. D. tm kim loi ny b nung nng bi mt ngun nhit.

Cu 143: Tia Rn-ghen (tia X) cA. cng bn cht vi tia t ngoi. B. tn s nh hn tn s ca tia hng ngoi.C. in tch m nn n b lch trong in trng v t trng.D. cng bn cht vi sng m.

Cu 144: Ht nhn C614 phng x - . Ht nhn con c sinh ra cA. 6 prtn v 7 ntrn B. 7 prtn v 7 ntrn C. 5 prtn v 6 ntrn D. 7 prtn v 6 ntrn.

Cu 145: Vi c l vn tc nh sng trong chn khng, h thc Anhxtanh gia nng lng ngh E v khi lngm ca vt l:

A. E = mc2/2 B. E = 2mc2 C. E= mc2 D. E = m2c

Cu 146: Cht phng x it I53131 c chu k bn r 8 ngy. Lc u c 200g cht ny. Sau 24 ngy, s gam itphng x b bin thnh cht khc l:

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A. 50g B. 25g C. 150g D. 175g

Cu 147: Cc nguyn t c gi l ng v khi ht nhn ca chng cA. cng khi lng B. cng s ntrn C. cng s nucln D. cng s prtn

Cu 148: Cho phn ng ht nhn: + A1327 X + n. Ht nhn X lA.Ne1020 B. Mg1224 C.Na1123 D. P1530

Cu 149: Ht pzitrn ( e+10 ) lA. ht n01 B. ht - . C. ht +. D. ht H11

Cu 150: Ban u c mt lng cht phng x X nguyn cht, c chu k bn r l T. Sau thi gian t = 2T k tthi im ban u, t s gia s ht nhn cht phng x X phn r thnh ht nhn ca nguyn t khc v s htnhn cht phng x X cn li l:

A. 1/3 B. 3. C. 4/3 D. 4.

Cu 151: Cho phn ng ht nhn + Al1327 P1530 + X th ht X lA.prtn. B. lectrn. C. ntrn. D.pzitrn.

Cu 152: Khi ni v phn ng ht nhn, pht biu no sau y l ng?A. Tng ng nng ca cc ht trc v sau phn ng ht nhn lun c bo ton.B.Nng lng ton phn trong phn ng ht nhn lun c bo ton.C. Tng khi lng ngh ca cc ht trc v sau phn ng ht nhn lun c bo ton.D. Tt c cc phn ng ht nhn u thu nng lng.

Cu 153: Plni op21084 phng x theo phng trnh: op

21084 X

A

Z ?? bp20682 . Ht X l

A. e01 B. e0

1 C. H42 D. . H

3

2

Cu 154: Ht nhn bn vng nht trong cc ht nhn eH42 , U

23592 , eF

5626 v sC

13755 l

A. eH42 . B. U

23592 . C. eF

5626 D. sC

13755 .

Cu 155: Ban u c N0 ht nhn ca mt cht phng x. Gi s sau 4 gi, tnh t lc ban u, c 75% s htnhn N0 b phn r. Chu k bn r ca cht l

A. 8 gi. B. 4 gi. C. 2 gi D. 3 gi.

Cu 156: Trong ht nhn nguyn t op21084 c

A. 84 prtn v 210 ntron. B. 126 prtn v 84 ntron.C. 210 prtn v 84 ntron. D. 84 prtn v 126 ntron.

Cu 157: Cc ht nhn ng v l nhng ht nhn cA. cng s nucln nhng khc s prtn. B. cng s ntron nhng khc s prtn.C. cng s nucln nhng khc s ntron. D. cng s prtn nhng khc s ntron.

Cu 158: Ban u c N0 ht nhn ca mt mu phng x nguyn cht. Bit chu k bn r ca cht phng x nyl T. Sau thi gian 3T, k t thi im ban u, s ht nhn cha phn r ca mu phng x ny bng

A.3

1N0. B.

4

1N0. C.

8

1N0. D.

5

1N0.

Cu 159: Ht nhn

16

C sau mt ln phng x to ra ht nhn

17

N. y lA.phng x . B.phng x +. C.phng x . D.phng x -.

Cu 160: Bit khi lng ca prtn l 1,00728 u; ca ntron l 1,00866 u; ca ht nhn 2311Na 22,98373 u v

1u = 931,5 MeV/c 2. Nng lng lin kt ca 2311Na bngA. 8,11 MeV. B. 81,11 MeV. C. 186,55 MeV. D. 18,66 MeV.

Cu 161: Cho phn ng ht nhn AZ X +94 Be

126 C + 0n. Trong phn ng ny

AZ X l

A.prtn. B. ht . C. lectron. D.pzitron.

Cu 162: So vi ht nhn 4020 Ca, ht nhn5627 Co c nhiu hn

A. 16 ntron v 11 prtn. B. 11 ntron v 16 prtn.

C. 9 ntron v 7 prtn. D. 7 ntron v 9 prtn.Cu 163: Khi mt ht nhn 23592U b phn hch th ta ra nng lng 200 MeV. Cho s A-v-ga-r N A =

6,02.1023 mol-1. Nu 1 g 23592U b phn hch hon ton th nng lng ta ra xp x bngA. 5,1.1016 J. B. 8,2.1010 J. C. 5,1.1010 J. D. 8,2.1016J.

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Cu 164: Ht nhn c ht khi cng ln th cA. nng lng lin kt cng ln. B. nng lng lin kt cng nh.C. nng lng lin kt cng ln. D. nng lng lin kt cng nh.

Cu 165: Cho khi lng ca ht prton; ntron v ht nhn teri 21 D ln lt l 1,0073u ; 1,0087u v 2,0136u.

Bit 1u = 931,5MeV/c2. Nng lng lin kt ring ca ht nhn teri 21 D l :A. 3,06 MeV/nucln B. 1,12 MeV/nucln C. 2,24 MeV/nucln D. 4,48 MeV/nucln

Cu 166: Tia X c cng bn cht vi :

A. tia + B. tia C. tia hng ngoi D. Tia Cu 167: Mt cht phng x c hng s phng x . thi im ban u c N0 ht nhn. S ht nhn b phnr sau thi gian t l:

A. t0N e B. 0N (1 t) C.

t0N (1 e )

D. t0N (1 e )

Cu 168: S prtn v s ntron trong ht nhn nguyn t 6730 Zn ln lt l:A. 30 v 37 B. 30 v 67 C. 67 v 30 D. 37 v 30

Cu 169: Ban u mt mu cht phng x nguyn cht c phng x ny l

A. 01

5H B. 0

1

10H C. 0

1

32H D. 0

1

16H

Cu 170: Ban u c N0 ht nhn ca mt ng v phng x. Sau 9 gi k t thi im ban u, c 87,5% s htnhn ca ng v ny b phn r. Chu k bn r ca ng v ny l

A. 24 gi B. 3 gi C. 30 gi D. 47 gi

Cu 171: Ht nhn Triti ( T13 ) cA. 3 nucln, trong c 1 prtn. B. 3 ntrn (ntron) v 1 prtn.C. 3 nucln, trong c 1 ntrn (ntron). D. 3 prtn v 1 ntrn (ntron).

Cu 172: Cc phn ng ht nhn tun theo nh lut bo tonA. s nucln. B. s ntrn (ntron). C. khi lng. D. s prtn.

Cu 173: Ht nhn cng bn vng khi cA. s nucln cng nh. B. s nucln cng ln.

C. nng lng lin kt cng ln. D. nng lng lin kt ring cng ln.Cu 174: Xt mt phn ng ht nhn: H12 + H12 He23 + n01 . Bit khi lng ca cc ht nhn H12 MH =2,0135u ; mHe = 3,0149u ; mn = 1,0087u ; 1 u = 931 MeV/c2. Nng lng phn ng trn to ra l

A. 7,4990 MeV. B. 2,7390 MeV. C. 1,8820 MeV. D. 3,1654 MeV.

Cu 175: Nng lng lin kt ring l nng lng lin ktA. tnh cho mt nucln. B. tnh ring cho ht nhn y.C. ca mt cp prtn-prtn. D. ca mt cp prtn-ntrn (ntron).

Cu 176: Gi s sau 3 gi phng x (k t thi im ban u) s ht nhn ca mt ng v phng x cn li bng25% s ht nhn ban u. Chu k bn r ca ng v phng x bng

A. 2 gi. B. 1,5 gi. C. 0,5 gi. D. 1 gi.

Cu 177: Phn ng nhit hch l sA. kt hp hai ht nhn rt nh thnh mt ht nhn nng hn trong iu kin nhit rt cao.B. kt hp hai ht nhn c s khi trung bnh thnh mt ht nhn rt nng nhit rt cao.C.phn chia mt ht nhn nh thnh hai ht nhn nh hn km theo s ta nhit.D.phn chia mt ht nhn rt nng thnh cc ht nhn nh hn.

Cu 178: Bit s Avgar l 6,02.1023/mol, khi lng mol ca urani U92238 l 238 g/mol. S ntrn (ntron)trong 119 gam urani U 238 l

A. 8,8.1025. B. 1,2.1025. C. 4,4.1025. D. 2,2.1025.

Cu 179: Ban u c 20 gam cht phng x X c chu k bn r T. Khi lng ca cht X cn li sau khong thigian 3T, k t thi im ban u bng

A. 3,2 gam. B. 2,5 gam. C. 4,5 gam. D. 1,5 gam.Cu 180: Khi ni v s phng x, pht biu no di y l ng?

A. S phng x ph thuc vo p sut tc dng ln b mt ca khi cht phng x.B. Chu k phng x ca mt cht ph thuc vo khi lng ca cht .C. Phng x l phn ng ht nhn to nng lng.

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D. S phng x ph thuc vo nhit ca cht phng x.

Cu 181: Phn ng nhit hch lA. ngun gc nng lng ca Mt Tri.B. s tch ht nhn nng thnh cc ht nhn nh nh nhit cao.C.phn ng ht nhn thu nng lng.D.phn ng kt hp hai ht nhn c khi lng trung bnh thnh mt ht nhn nng.

Cu 182: Ht nhn 22688 Ra bin i thnh ht nhn222

86 Rn do phng x

A. v -

. B. -

. C. . D. +

Cu 183: Ht nhn 104 Be c khi lng 10,0135u. Khi lng ca ntrn (ntron) mn = 1,0087u, khi lng ca

prtn (prton) mP = 1,0073u, 1u = 931 MeV/c2. Nng lng lin kt ring ca ht nhn10

4 Be lA. 0,6321 MeV. B. 63,2152 MeV. C. 6,3215 MeV. D. 632,1531 MeV.

Cu 184: Cho phn ng ht nhn: 23 1 4 2011 1 2 10Na H He Ne+ + . Ly khi lng cc ht nhn2311Na ;

2010Ne ;

42 He ;

11H ln lt l 22,9837 u; 19,9869 u; 4,0015 u; 1,0073 u v 1u = 931,5 MeV/c

2. Trong phn ng ny, nng lngA. thu vo l 3,4524 MeV. B. thu vo l 2,4219 MeV.C. ta ra l 2,4219 MeV. D. ta ra l 3,4524 MeV.

Cu 185: Bit khi lng ca prtn; ntron; ht nhn 168 O ln lt l 1,0073 u; 1,0087 u; 15,9904 u v 1u =

931,5 MeV/c2. Nng lng lin kt ca ht nhn 168 O xp x bngA. 14,25 MeV. B. 18,76 MeV. C. 128,17 MeV. D. 190,81 MeV.

Cu 186: Trong s phn hch ca ht nhn 23592 U , gi k l h s nhn ntron. Pht biu no sau y l ng?A.Nu k < 1 th phn ng phn hch dy chuyn xy ra v nng lng ta ra tng nhanh.B.Nu k > 1 th phn ng phn hch dy chuyn t duy tr v c th gy nn bng n.C.Nu k > 1 th phn ng phn hch dy chuyn khng xy ra.D.Nu k = 1 th phn ng phn hch dy chuyn khng xy ra.

Cu 187: Khi ni v tia , pht biu no sau y l sai?A. Tia phng ra t ht nhn vi tc bng 2000 m/s.

B. Khi i qua in trng gia hai bn t in, tia b lch v pha bn m ca t in.C. Khi i trong khng kh, tia lm ion ha khng kh v mt dn nng lng.D. Tia l dng cc ht nhn heli ( 42He ).

Cu 188: So vi ht nhn 2914 Si , ht nhn4020 Ca c nhiu hn

A. 11 ntrn v 6 prtn. B. 5 ntrn v 6 prtn.C. 6 ntrn v 5 prtn. D. 5 ntrn v 12 prtn.

Cu 189: Phn ng nhit hch lA. s kt hp hai ht nhn c s khi trung bnh to thnh ht nhn nng hn.B.phn ng ht nhn thu nng lng .C.phn ng trong mt ht nhn nng v thnh hai mnh nh hn.D.phn ng ht nhn ta nng lng.

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