chapter test review, lessons 4-1 to 4-5 s1. graph q l. 0 t

Tsokos Chapter Test Review Lsn 4-1 To 4-5.Doc Updated: 10-Apr-12 of 13

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CHAPTER TEST REVIEW, LESSONS 4-1 TO 4-5

S1. Water waves at the surface of a pond pass a floating log of length L. The log is at rest relative to the bank. The

diagram shows wave crests at one instant.

L

The number of crests passing the log per unit time is N. The speed of the water waves relative to the log at rest

is

A. 7

L(N – 1).

B. 6

L(N – 1).

C. 7

L(N).

D. 6

L(N).

(1)

S31. Graph P shows how the displacement

at one point in a wave varies with time.

Graph Q shows how the displacement

in the same wave varies with distance

along the wave at one particular time.

Which one of the following

expressions gives the speed of the

wave?

A. 1

1

t

x

B. 2

2

t

x

C. 12

12

tt

xx

D. 12

13

tt

xx

(1)

IIBB PPHHYYSSIICCSS

Name: __________________________________

Period: ________ Date: ___________________

0

0

t

x x

t

x

0

0

displacement

displacement

2

2 3

1

1

time

distance

Graph P

Graph Q


S7. The diagram below shows ocean waves incident on a stone barrier

protecting boats anchored behind it. The boats could still be at risk of

damage by waves mainly as a result of

A. refraction.

B. standing waves.

C. diffraction.

D. reflection. (1)

S69. The phenomenon of diffraction is associated with

A. sound waves only.

B. light waves only.

C. water waves only.

D. all waves. (1)

S13. Which diagram best shows diffraction of plane wavefronts at a single slit?

A.

C.

B.

D.

(1)

S67. Plane parallel wavefronts are incident on an obstacle. Which of the following diagrams best shows the

diffraction of the waves around the obstacle?

Boats

Barrier

Waves


A. B.

C. D.

(1)

S56. A string is held horizontally with one end attached to a fixed support. Two pulses are created at the free end of

the string. The pulses are moving towards the fixed support as shown in the diagram below.

string

fixed support

Which one of the following diagrams is a possible subsequent picture of the string?

A. B.

C. D.

(1)

S10. Two particles X and Y are situated a distance 2

1 apart on a stationary wave of wavelength λ. The variation

with time t of the displacement dx of X is shown below.

0

d

t0

X


Which one of the following correctly shows the variation with time t of the displacement dY of particle Y?

0

0

0

0

d

d

d

d

t

t

t

t

0

0

0

0

A.

C.

B.

D.

Y

Y

Y

Y

(1)

S37. For a standing wave, all the particles between two successive nodes have the same

A. amplitude only.

B. frequency only.

C. amplitude and frequency.

D. frequency and energy. (1)

S43. Which one of the following is correct for transfer of energy along a standing wave and for amplitude of

vibration of the standing wave?

Transfer of energy along

a standing wave

Amplitude of vibration of

the standing wave

A. None Constant amplitude

B. None Variable amplitude

C. Energy is transferred Constant amplitude

D. Energy is transferred Variable amplitude (1)

S50. The diagram below shows a transverse wave on a string. The wave is moving from right to left.

X

Y

direction of wave

upwards

left right

downwards


In the position shown, point X has zero displacement and point Y is at a position of maximum displacement.

Which one of the following gives the subsequent direction of motion of point X and of point Y?

Point X Point Y

A. left left

B. upwards upwards

C. downwards left

D. downwards upwards (1)

S72. One end of a long string is vibrated at a constant frequency f. A travelling wave of wavelength and speed v is

set up on the string. The frequency of vibration is doubled but the tension in the string is unchanged. Which of

the following shows the wavelength and speed of the new travelling wave?

Wavelength Speed

A. 2

λ v

B. 2

λ 2v

C. 2 v

D. 2 2v

(1)

S75. Which statement is true for standing (stationary) waves?

A. All points in the wave vibrate in phase.

B. There is no energy in a standing wave.

C. The wavelength of the wave is the distance between adjacent nodes.

D. Neighbouring points in the wave have different amplitudes of vibration. (1)

S81. The graph below shows the variation with time t of the displacement x of a particle undergoing simple

harmonic motion.

Which graph correctly shows the variation with time t of the acceleration a of the particle?


(1)

S82. A wooden block is at rest on a horizontal frictionless surface. A horizontal spring is attached between the block

and a rigid support.

The block is displaced to the right by an amount X and is then released. The period of oscillations is T and the

total energy of the system is E. For an initial displacement of 2

X which of the following shows the best

estimate for the period of oscillations and the total energy of the system?

Period Total energy

A. T

2

E

B. T

4

E

C.

2

T

2

E

D.

2

T

4

E

(1)

S30. This question is about waves and wave motion.

(a) Describe, by reference to the propagation of energy, what is meant by a transverse wave.

Transverse wave (2)

.....................................................................................................................................

.....................................................................................................................................


.....................................................................................................................................

.....................................................................................................................................

(b) State one example, other than a wave on a string, of a transverse wave.

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

A transverse wave is travelling along a string that is under tension. The diagram below shows the displacement

of part of the string at time t = 0. The dotted line shows the position of the string when there is no wave

travelling along it.

distance along string / cm5.0 15 25 35 45

displacement / cm

(c) On the diagram above, draw lines to identify for this wave

(i) the amplitude (label this A); (1)

(ii) the wavelength (label this λ). (1)

(d) The period of the wave is 1.2 × 10–3

s. Deduce that the speed of the wave is 250 m s–1

.

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

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

(e) Using the axes below, draw the displacement of the string when t = 3.0 × 10–4

s. (The displacement of the

string at t = 0 is shown as a dotted line.)


distance along string / cm5.0 15 25 35 45

displacement / cm

(3)

S63. Waves on a string

A travelling wave is created on a string. The graph below shows the variation with time t of the displacement y

of a particular point on the string.

2.0

1.0

0.0

–1.0

–2.0

0.50.40.30.20.10.0

t / ms

Graph 1 / mmy

The variation with distance x of the displacement y of the string at t = 0 is shown below.

2.0

1.0

0.0

–1.0

–2.0

0.50.40.30.20.10.0x / cm

Graph 2 / mmy

(a) Use information from the graphs to calculate, for this wave,

(i) the wavelength;

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

(ii) the frequency;

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


(iii) the speed of the wave.

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

(b) The wave is moving from left to right and has period T.

(i) On graph 1, draw a labelled line to indicate the amplitude of the wave. (1)

(ii) On graph 2, draw the displacement of the string at .4

Tt

(2)

S22. A source of sound emits waves of wavelength λ, period T and speed v when at rest. The source moves away

from a stationary observer at speed V, relative to the observer. The wavelength of the sound waves, as

measured by the observer is

A. λ + vT.

B. λ – vT.

C. λ +VT.

D. λ – VT. (1)

S36. The speed of sound in still air is c. A source of sound moves away from an observer at speed v. What will be the

speed of sound as measured by the observer?

A. c

B. c + v

C. c – v

D. v – c (1)

S49. A point source is moving at a constant speed in a straight-line towards the right and emits sound waves of

constant frequency. The speed of the source is less than the speed of sound. Which of the diagrams correctly

shows the wavefronts emitted by the source?

A. B.

C. D.

(1)

S59. A stationary source emits sound of frequency f0. An observer is moving towards the source at constant speed

along the path indicated by the dotted line. The observer passes very close to the source at time T.


observer

stationary source

Which one of the following graphs best shows the variation with time t of the frequency f heard by the

observer?

A. f

f0

B. f

f0

T t T t

C. f

f0

D. f

f0

T t T t (1)

S64. A police car, sounding its siren, is travelling at constant speed towards a stationary observer. The sound emitted

by the siren is of constant frequency. The frequency of the sound as heard by the observer is higher than that

heard by the driver of the police car. The reason for this is that

A. the wavefronts received by the observer are closer together than the wavefronts received by the driver.

B. the speed of the wavefronts is greater as measured by the observer than by the driver.

C. the speed of the wavefronts is less as measured by the observer than by the driver.

D. the wavefronts received by the observer are further apart than the wavefronts received by the driver. (1)

S68. Which of the following is a correct description of the Doppler effect?

A. Change in frequency of light due to motion of the source of light.

B. Change in frequency of light due to relative motion between the source of light and the observer.

C. Change in observed frequency of light due to relative motion between the source of light and the

observer.

D. Change in observed frequency of light due to change in velocity of the source of light. (1)

S80. Sound of a constant frequency f0 is being emitted by a sound source. An observer O travels in the direction

shown at a speed of 0.1 v where v is the speed of sound.

observer

O

sound source

Which of the following gives the relationship between f0 and the frequency f of observed sound?


A. f = 1.1f0

B. f0 < f < 1.1f0

C. f = 0.9f0

D. f0 > f > 0.9f0

(1)

S23. What change, if any, occurs in the wavelength and frequency of a light wave as it crosses a boundary from air

into glass?

Wavelength Frequency

A. Decreases Decreases

B. Decreases Unchanged

C. Increases Increases

D. Increases Unchanged

(1)

S51. Light is incident on an air-glass boundary as shown below.

PQ

air

R glassS

Which one of the following is a correct statement of Snell’s law?

A. sin P = constant sin R

B. sin P = constant sin S

C. sin Q = constant sin R

D. sin Q = constant sin S (1)

S61. Waves of frequency f travel with speed c in air and enter a medium M of refractive index 1.5. Which of the

following correctly gives the frequency and speed of the waves in the medium M?

frequency speed

A. f 5.1

c

B. f 1.5c

C. 1.5f c

D. 5.1

f c

(1)

S70. The diagram below shows plane wavefronts of a wave that is approaching the boundary between two media, X

and Y. The speed of the wave is greater in medium X than in medium Y. The wave crosses the boundary.


medium X

boundary

medium Y

Which of the following diagrams is correct?

medium X medium Y medium X medium Y

medium X medium Y medium X medium Y

A. B.

C. D.

(1)

S24. The variation with time t of the separate displacements d of a point in a

medium due to two waves is shown below.

The waves are superposed. Which of the following diagrams shows the

variation with time t of the resultant displacement d of the point in the

medium?

+2a

+a

+a

0

0

–a

–a

–2a

d

d

t

t


+2a +2a

+3a +3a

+a +a

+a+a

0 0

00

–a –a

–a–a

–2a –2a

–3a –3a

d d

dd

t t

tt

A. B.

C. D.

(1)

S47. A bat approaches an insect of wing span length d. The bat emits a sound wave. The bat detects the insect if the

sound is reflected from the insect.

d

refected waves incident waves

The insect will not be located if

A. the insect’s speed is less than the speed of the sound wave.

B. the insect’s wing beat frequency is greater than the frequency of the sound wave.

C. the length d is much greater than the wavelength of the sound wave.

D. the length d is much smaller than the wavelength of the sound wave. (1)

chapter test review, lessons 4-1 to 4-5 s1. graph q l. 0 t

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