Waves for student

7/29/2019 Waves for student

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CHAPTER 1 WAVES

1.1 Understanding Waves ( / 25 X 100 % = )

Learning Outcomes

A student is able to :

Describe what is meant by wave motion.

Recognise that waves transfer energy without transferring matter.

Compare transverse and longitudinal waves and give examples of each.

State what is meant by a wavefront.

State the direction of propagation of waves in relation to wavefronts

.define

i. amplitudeii. period,

iii. frequency,iv. wavelength,v. wave speed.

Sketch and interpret a displacement-time graph for a wave.

Sketch and interpret a displacement-distance graph for a wave,

Clarify the relationship between speed, wavelength and frequency

.Solve problems involving speed, wavelength and frequency.

Describe damping in a oscillating system.

Describe resonance in a oscillating system.

1. Fill in the blanks by choosing a words given.

parallel perpendicular rarefraction trough compression crest

a) The wave that travels along the spring consists of a series(1)..and (2).

b) A longitudinal wave is a wave in which the vibration of the mediumis (3).to the direction of propagation of the wave.

c) A transverse wave is produced when the vibration of the medium is(4).to the direction of propagation of wave.

d) The wavelength is the distance between two adjacent(5)or two adjacent(6)..

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2. Match the following terms with the meaning given.

Terms Meaning

Wavefront 1 (7) The displacement of acrest or a trough fromthe equilibriumposition of a wave.

Wavelength 2(8) The number of waves

produced by a sourcein one unit time.

Amplitude 3(9) The distance between

two adjacent points ofthe same phase onwave.

Frequency 4

(10) Lines joining all points

of the same phase.

Wavespeed 5(11) The measurement of

how a crest is movingfrom a fixed point.

Period 6(12) Time taken for an

oscillation to completeone cycle.

3. Complete the sentence and chart given below with suitable words.

a) In a damping oscillation,(13)........................and (14).

remain constant while (15)... decreases.

(16,17,18,19)

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Examples ofDamping in oscillating system

1

3

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b) State two causes of damping in an oscillating system:

i. (20)

ii. (21)

3. Figure shows the displacement-distance and displacement time graphs of anoscillating system.

From the graphs determine the.

a) Period :.(22)

b) Frequency :..(23)

c) Wavelength :.(24)

d) Speed of the waves.:(25)

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1.2 : Analysing reflection of waves ( / 10 X 100 % = )

Learning Outcomes


Describe reflection of waves in terms of the angle of incidence, angle of reflection,

wavelength, frequency, speed and direction of propagation.

Draw a diagram to show reflection of waves.

1. Diagram 1.1 and 1.2 shows water waves and sound waves propagating towards areflector.

Diagram 1.1

Diagram 1.2

a ) ( i) What is meant by reflected waves?

(1)

( ii) Complete the diagrams 1.1 and 1.2 to show the phenomena of reflection ofwaves.

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(2),(3),(4),(5)

(iii) With reference to diagram 1.1 and 1.2,compare the incident and reflected angle,wavelenght, frequency, speed and direction of propagation of the reflectedwave with the incident wave. Complete the table with a suitable word..

Angle of reflection..the angle of incidence(6)

Wavelength remains unchanged

Frequency .(7)

Speed .(8)

Direction of thepropagation

.(9)

(iv) State the principle of the reflection of waves.

.(10)

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1.3 Analysing refraction of waves ( / 12 X 100 % = )

Learning Outcomes


describe refraction of waves in terms angle of incidence, angle of refraction,

wavelength, frequency , speed and direction of propagation.

Draw a diagram to show refraction of waves.

1. Figure below shows the plane waves approaching a convex-shaped shallow area.

(a) Complete the diagram by drawing the wavefronts of the waves entering the shallowarea. Label clearly the wavelength in a shallow area with 1 and in deep area with2. (1),(2),(3)

(b) Complete the table below, to show what happen to wavelength, frequency, speed

and direction of the propagation of wave after the phenomena of refraction.

Wavelength (4)

Frequency (5)

Speed (6)

Direction of thepropagation

(7)

2. Diagram below shows the phenomena ofrefraction of water wave of the sea water

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1. Why are the speed and wavelength of waves in the middle of the sea almostuniform?

.(8)

2. Why do the distances between the wavefronts decrease as the waves approach the

beach?

(9)

3. Why is the water in the bay stationary compared to the water at the cape?

i.

ii

iii..

(10),(11),(12)

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1.4 Analysing diffraction of waves ( / 18 X 100 % = . )

Learning OutcomesA student is able to

describe diffraction of waves in terms of wavelength, frequency, speed,

direction of propagation and shape of waves,

draw a diagram to show diffraction of waves.

1. Diagram 1 shows a listener who is able to hear the sound of the radio behind the wall ofa building.

Diagram 1.

Name the wave phenomenon shown in the diagram above _____________________(1)2. _________________(2) of waves is a phenomenon in which waves _____________(3)as they pass through a _______________(4) or round an ________________(5).

3. Diagram 3a and 3b shows water waves passing through a narrow gap and a wider gaprespectively.

(6) (7)

Diagram 3a Diagram 3b

(a) Complete diagrams 3a and 3b above to show the wave pattern after passing throughthe gaps.

(b) Based on your answer in (a) state the relationship between the wavelength , size of thegaps and the wave pattern formed.

_______________________________________________________________________

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_______________________________________________________________________

(8),(9)(c) Compare the water waves before and after passing through the gap in terms of

(i) wavelength :_____________________(10)

(ii) Frequency :______________________(11)

(iii) Speed :_________________________(12)

(iv) Amplitude :______________________(13)

2. Diagram 4 shows light from a laser pen is diffracted if it passes through a narrowslit comparable in size to its wavelength.

(a) In the space below , draw and label the diffraction pattern of light through anarrow slit.

(14)

(b) As the light passes through the single slit , it is diffracted to produce a wide__________ (15) fringe at the centre.

(c) After diffraction , interference also occur to produce alternate bright and________ (16) fringes at the side of the middle bright fringe.

(d) The bright fringe is caused by ____________(17) interference and the darkfringe is produced by ___________ (18) interference.

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1.5 Interference of Waves ( .../ 20 x 100 % = ... )

Learning OutcomesA student is able to :

state the principle of superposition

explain the interference of waves

draw interference patterns

interpret interference patterns

apply the following formula in problem solving

D

ax=

1. State the Principle of Superposition of waves.

(1)

2. Interference is the superposition of two coherent waves. Two waves arecoherent if they have the same wavelength , same ______________(2) andconstant ________________________(3).

3. Complete the table below

(a)Superpositionof two crests

Constructiveinterference

(b)Superpositionof twotroughs

(4) (5)

(c)Superpositionof a crest anda trough

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(6) (7)

4. Diagram 4 shows an interference pattern produced by two coherent sources P and Q

P QDiagram 4

In the diagram above , draw and label one antinodal and one nodal line.(8), (9)

5. Complete the table below to compare sound and light waves.

Light Sound

Constructiveinterference

Bright fringes(10)

Destructive

interference (11) (12)

6. Diagram 6 shows an experiment to study the interference of light waves.

Diagram 6(a) What is meant by monochromatic light ?

______________________________________________________________(13)

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(b) In the boxes above , label a , x and D wherea = distance___________________________________________________(14)x = distance___________________________________________________(15)D = distance __________________________________________________ (16)

(c ) What is the relationship between a, x, D and ?(17)

(d ) Calculate the wavelength of light used if a = 0. 2 mm , x = 3 mm , and D is 4 m.

[D

ax= ] (18)

7 Two loud speakers placed 2 m apart are connected to an audio signal generatorthat is adjusted to produce sound waves of frequency 550 Hz. The detection ofloud and soft sounds as a person moves along a line is at 4.0 m from theloudspeakers. The distance between 2 consecutive loud sounds is 0.5 m.

Calculate the

(a) Wavelength of the sound waves. (19)(b) speed of the sound waves. (20)

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1.6 Sound Waves ( ./ 20 x 100 % = . % )Learning Outcomes


describe sound waves

explain how the loudness relates to amplitude.

explain how the pitch relates to frequency.

describe applications of reflection of sound waves.

calculate distances using the reflection of sound waves.

1. Fill in the blanks.(a) Sound waves are __________________(1) waves .(b) Sound waves are produced when a vibrating object causes air molecules around

it to __________(2) and producing a series of ___________(3) and___________(4)

2. Diagram 2 shows a tuning fork producing sound waves.

Diagram 2

(a) Label the wavelength (5)(b) Label areas of compression (6) and rarefaction (7)

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3. Complete the concept map below.

(8),(9),(10),(11),(12),(13)

4. Diagram 4 shows a submarine transmitting ultrasonic waves directed at a big rockon the sea bed. After sometime, the submarine detects the wave again.

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DIAGRAM 4.

Low pitch, loud sound, soft sound, high pitch


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(a) State the wave phenomenon involved.

________________________(14)

(b) State 2 reasons why the submarine used ultrasonic wave but not ordinary soundwave.

1.........................................................................................................................(15)

2.........................................................................................................................(16)

(c) Calculate the distance of the submarine from the big rock if the submarinedetects the second wave after 1.5 seconds. [Velocity of ultrasonic wave =1560 m s-1]

(17),(18)

(d) State 2 other applications of sound waves.

1. ..

2. (19),(20)

1.7 Analysing electromagnetic spectrum ( .... / 20 x 100 % = ..)

Learning Outcomes1. Diagram 1 show the electromagnetic spectrum. Write the names of the electromagnetic

waves in the boxes provided.

Diagram 1

(1),(2),(3)2. Electromagnetic waves are __________(4) waves ,consisting of_________ (5) fields and

netic fields vibrating _____________(6) to each other.

3. _____________(7) has the highest frequency and the _________(8) wavelength.

4. List 4 properties of electromagnetic waves.

(i) _______________________________________________

(II) _______________________________________________

(III)_______________________________________________

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(IV) ______________________________________________

(9),(10),(11),(12)

5. Diagram 2 show electromagnetic waves. Match the correct source by drawing lines fromthe boxes to the respective sources.

(13),(14),(15),(16)

6. Name the electromagnetic wave which is used in the following appliance:

(i) FM Radio ________________________________(17)

(ii) Oven _____________________________________(18)

(iii) Communication Satellite______________________(19)

(iv) Taking pictures of bones______________________(20)

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Waves for student