A-N__

Terms of Light

Light is a form of energy that originates at the sun. It is a form of energy that is visible to the humaneye. Match each term in the word box to its definition.

visible light spectrum troughhertz wave velocity frequencyreflection wavelength prismrefraction photon light

crest

This refers to the bending of light waves when they pass throughanother substance.

This is the bounce of a light wave off another object.

This is a particle of light.

This term refers to the highest point of a wave.

This is a type of electromagnetic radiation.

This is the distance between corresponding points on two waves.

v’1 f’L(iThis is a continuous band of colors arranged according to wavelength

- or frequency.

This is the lowest point of a light wave.

1( ( S 1Y) This is triangular-shaped glass or other transparent material thatrefracts white light into a spectrum of colors.

e \z’Ck\f.. \J etc Ci

,

This is calculated by multiplying frequency times wavelength.

This is a measurement unit for frequency.

1z U LLU I/ This refers to the number of waves that pass a given point in onesecond.

Mame Date

CO C

•

•

J

O Csest

0

______

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6 light and Sound

Diagram of a WaveBoth light and sound travel in waves. Use the terms in the word box to label the parts of a wave.

amplitude wavelength crest equilibrium trough

Match each term in the word box above to its description.

t This is a measure from a point on one wave to the corresponding pointon the next wave.

• 1J’ This is the lowest point on a wave.

0 (1S+ This is the highest point on a wave.

ktk.t This is the distance a wave rises or falls from its equilibrium.

If This describes when the wave is at a rest position.

Name AnSIk3 Date

0

I

Lightanci Sound 81

Classify Refraction MaterialsVisible light can pass through some types of matter but not others. Light can pass through somematerials almost unchanged. Other materials scatter light or do not allow it to pass through at all.Use the first set of terms tà label each material’s effect on light. Then classify the second set of terms!nto the correct columns.

light passes through light does not pass through light scatters

aluminum foil plastic wrap cardboardwindow glass stained glass textured glasswax paper plywood construction paperoiled paper velvet vellumclear water silty water mud

prism sheer fabric car windshield

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Name Date

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light and Sound 95

Name

_______________________________________

Date

Light WavesLight is an example of radiant energy. The human eye is only able to see light of a certainwavelength. However, there are other wavelengths that are not visible to the human eye. Use theterms in the word box to label the diagram of the radiant energy spectrum.

C long radio waves X-rays microwaves ultraviolet raysvisible light infrared rays short radio waves gamma rays

CtC

C

I;88 Lightand Sound

(c)th

em

oon,w

hichtravels

aroundth

eB

arthsix

times

in1

63

.8d

Calculate

thefrequency

of

eachof

thefollow

ingperiods.

/‘(a)

5.O

s(b)

0.8

0s

,.

(c)2.5

x102

s(d)

0.40m

mC

alculatethe

periodof

eachofthe

following

frequencies.(a)

10

Hz

(b)0

.25

Hz

(c)5

00

kH

z(d)

3.5H

zT

hehorizontal

distancebetw

eenthe

endpoints

inthe

swing

ofa

pen

du

lum

is8.0

cm.

What

isthe

amplitude?

The

tine

ofa

tuningfork,

when

struck,has

anam

plitudeof

0.13cm

.If

thefrequency

ofthe

forkis

200H

z,w

hat

totaldistance

will

thetine

travelin

1.00m

m?

16.A

crosssection

ofaw

aveis

shown

below.

Nam

ethe

partsof

the

wave

indicatedby

the

letterson

thediagram

.

(a)B

ym

easuring,findth

ew

avelength-

waves.

(b)If

crestAtakes

2.0s

tom

oveto

where

crestC

isnow

,(i)

what

isthe

speedof

thew

aves?(ii)

wh

atis

thefrequency

ofthew

aves?

//6”7

N\

I.

The

wav

elength

ola

water

wave

is8.0

inand

itsspeed

is2.0

mIs.

110wm

anyw

avesw

illpass

afixed

poin

tin

thc

water

iii1.0

mm

?I).

Exam

inethis

diagramof

aw

aveand

1ist

allpairsof

pointsth

atare

inphase.

‘(b)

determ

ine

thew

avelength,in

centimetres,

bym

easure

ment.

(c)determ

ine

the

speedof

thew

aves,if

theytake

0.50s

totravel

fromX

toY

.W

aterw

avesw

itha

wavelength

of6.0

mapproach

alighthouse

‘at

5.6rn/s.

(a)W

hatis

the

frequencyof

the

waves?

What

isth

eirperiod?

1.

5.0lIz

waves

move

alonga

ropew

itha

wavelength

of40

cm.

What

isth

eirspeed?

-&

The

distancebetw

eensuccessive

crestsin

aseries

ofw

aterw

avesis

5.0rn,and

thecrests

travel8.6

min

5.0s.C

alculatethe

-frequency

ofablock

ofwood

bobbingup

anddow

nin

thew

ater.T

wo

peopleare

fishingfrom

small

boatslocated

30m

apart.W

avespass

thro

ug

hth

ew

ater,and

eachperson’s

boatbobs

upand

down

15tim

esin

1.0m

m.

At

atim

ew

hen

oneboat

ison

acrest,th

eo

ther

oneis

ina

trough,andth

ereis

onecrestbetw

eenthe

two

boats.W

hatis

thespeed

ofthe

waves?

The

wavelength

ofa

water

wave

is3.7

mand

itsperiod

is1.5

s.C

alculate(a)

the

speedof

the

wave.

(b)th

etim

erequired

forth

ew

aveto

travel100

m.

;/

(c)the

distancetravelled

byth

ew

avein

1.00m

m.

2&

Aw

aterw

avetravels

60cm

in2.0

s.If

the

wavelength

is5.0

cm,

wh

atis

thefrequency

ofthe

wave?

Aboat

atanch

or

isrocked

byw

avesw

hosecrests

are30

mapart

and

whose

speedis

8.0rn/s.

What

isthe

intervalof

time

betw

eencrests

strikingth

eboat?

oftlw

27.W

hatis

thespeed

ofa

soundw

avew

itha

wavelength

of3.4

man

da

frequencyof

100H

z?

17.T

hediagram

shows

the

profileofw

avesin

aripple

tank.

directionof

wave

motion

undtuthed

f4N

\/N

J/T

h

1- 11

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LE

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EZ

Z

3ZE

IE

EE

Ez

l,

(l(J)O

ui

‘ç,í

1—

—-T

h_—

Yt

rr

IT

EEEE

z’EH

}ELT4

f‘

1g?h

-I

Y1Z

_

z±

frI*zH

:4:H

Hz

1:IL

EH

__

-

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$3

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1_

WL

,C

A10

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ZtZ

E

-H

__

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--f

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—4

-—.-

—-—

-

10.5T

ransmission

and

Reflection

1.T

hew

avelen

gth

ofa

water

wave

ina

rippletan

kis

0.080m

.If th

e

frequen

cyof

the

wave

is2.5

Hz,w

hat

isits

speed?V

=fA(2.5

Hz)(0.080

m)

0.20m

Is

2.T

hedistance

betw

eensuccessive

crestsin

aseries

ofw

aterw

aves

is4.0

m,

andthe

creststravel

9.0m

in4.5

s.W

hat

isth

efre

quen

cyof

thew

aves?M

V=—

9.0m

4.5s

=2.0

mIs

V

—2.0

mIs

—4.0

m=

0.50H

z3.

The

perio

dof

aso

und

wave

froma

pian

ois

1.18x

i0’

s.If

the

speedof

the

wave

inair

is3.4

x102

mIs,

what

isits

wav

elength

?

v=

fA

Therefo

re

Aor

v=

A=

VT

=(3

.4x

102m

/s)(1.1

8x

1W’

s)=

0.40m

Practice

1.A

source

with

afreq

uen

cyof

20H

zproduces

water

waves

thii

hav

ea

wav

elength

of3.0

cm.

What

isth

espeed

ofth

ew

aves?

Aw

avein

arope

travelsat a

speedof

2.5

m/s.

Ifthe

wav

elength

i

.3m

,w

hat

isth

eperio

dof

thew

ave?

3.W

avestravel

along

aw

ireat

aspeed

of10

rn/s.F

indth

efic

quen

cyof

the

sourceif

the

wav

elength

is0.10

iii

4.A

sound

wave

travelsat

350rn/s.

What

isth

ew

avelen

gth

oF‘

sound

with

afreq

uen

cyof

1.4x

10’H

z?5.

Agiven

crestofa

water

wave

requires

5.2s

totravel b

etween

IW

(

poin

tson

afishing

pier

located19

rnapart.

Itis

noted

ina

seit”.

ofw

avesth

at20

crestspass

the

firstpoin

tin

17s.

What

is11w

wav

elength

ofth

ew

aves?6.

An

FM

station

broadcastsradio

signalsw

itha

frequency‘I

92.6M

Hz.

Ifth

eseradio

waves

travelat

aspeed

ol

3.00x

IOin

/s.

what

isth

eirw

avelen

gth

?

Water

waves

and

waves

inlo

ng

springstravel

atlong

asth

em

ediu

mth

eyare

indoes

not

change.tw

olong

springsth

atdiffer

instiffness

arejo

ine

that

the

speedof

aw

avech

anges

abru

ptly

atth

the

two

springs.W

itha

speedch

ange

there

wav

elength

chan

ge.

This

wav

elength

chan

ge

iW

aveE

quation,v

=fA

.S

inceth

efreq

uen

cyconstant

oncethe

wave

isgenerated,

thew

a’spro

portio

nal

toth

espeed,

that

is,Aa

v.W

hen

aw

avetravels

froma

light

ropeinto

ath

esam

eten

sion,

the

wave

slows

dow

nan

decreases.O

nth

eoth

erhan

d,

ifth

ew

avetravels

toa

lightrope,

both

the

speedan

dth

ew

avelen

pro

perties

aretru

eof

allw

aves.A

changein

changesboth

inth

espeed

ofth

ew

aveand

inil

med

ium

where

the

speedis

constan

t,th

erelatio

nth

atAa

1/f.In

oth

erw

ords,if

the

frequencyof

aw

avelengthdecreascs,

afact

easilydem

onstratdifferent

frequen

ciesare

gen

eratedin

arope

orsp

tion

10.2on

page296).

One-d

imen

sional

waves

such

asthose

ina

spr

ina

specialw

ayw

hen

they

arereflected.

Inth

froma

rigidobstacle,

usuallyreferred

toas

fixe

the

pulseis

inverted

.A

crestis

reflectedas

atroL

reflectedas

acrest.

On

theoth

erhan

d,

ifthe

reflefree

end,

where

the

med

ium

isfree

tom

ove,

thei

crestsare

reflectedas

crestsan

dtro

ughs

astrou:

endan

dfree-en

dreflectio

nth

ereis

no

chan

ge

Lw

avelen

gth

.N

oris

there

anych

ange

inthe

speedth

em

ediu

mis

the

same.

fixed

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Station #2: Angles

Using a protractor, determine the angles that I have lettered a — f

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object , C F

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BEHAVIOR OF LIGHT REVIEWRearrange the letters to spell the words that belong in the spaces. Then find the words in the puzzle.

1. Light is a form of ! energy. ARDIAN)2. Light travels in lines. (THIRTAGS)3. An object that lets light pass through it is 1&JVL p(X1fl+ . (SANTERPRANT)4. When light rays are bent, we say they are (r&I)c4d

. (CREAFDERT)5. If an object lets no light pass through it, it is OpO6U

. (EPOQUA)6. A rainbow of colors is called a

______________________________________

. (MECTURPS)7. When light rays bounce back, we say they are

__________________________

. (FLERTDEEC)8. \L OII is the color of the spectrum that is bent the most. (TOIVEL)9. Light we can see is called

__________________________________________

light. (BLIEVIS)10. A dark color (95o (b5 more light than a light color. (BASROBS)

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Name

. . . . I I •

Date

LIGHT & SOUND . . . I • • .

Copyright © 2000— Mllflken Publishing Co. All rights reserved. MP3426 Ught & Sound