WAV Question Pack (1)

8/12/2019 WAV Question Pack (1)

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1. A transverse travelling wave has amplitude A0and wavelength .

The distance between a crest and its neighbouring trough, measured in the direction of energy

transfer of the wave is equal to

A. A0.

B. 2A0.

. 2

.

!. .(1)

2. "ne end of a long string is vibrated at a constant frequencyf. A travelling wave of wavelength

and speed vis set up on the string.

The frequency of vibration is doubled but the tension in the string is unchanged. #hich of the

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

Wavelength Speed

A. 2

v

B.2

2v

. 2 v

!. 2 2v

(1)

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3. A water surface wave %ripple& is travelling to the right on the surface of a la'e. The wave has

period T. The diagram below shows the surface of the la'e at a particular instant of time. A

piece of cor' is floating in the water in the position shown.

#hich is the correct position of the cor' a time(

T

later$

c o r '

A . B .

. ! .(1)

4. A source produces water waves of frequency )0 *+. The graph shows the variation with

hori+ontal position of the vertical displacement of the surface of water at one instant in time.

v e r t i c a l d i s p l a c e m e n t , c m0 . (

0

- 0 . (

0 ) . 0 ( . 0 . 02 . 0 h o r i + o n t a l p o s i t i o n , c m

The speed of the water waves is

A. 0.20 cm s/)

.

B. (.0 cm s/)

.

. )0 cm s/).

!. 20 cm s/)

.(1)

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7. A wave is travelling through a medium. The diagram shows the variation with time tof the

displacement dof a particle of the medium from t 0 to t 23 ms.

) . 3

)

0 . 3

0

- 0 . 3

- )

- ) . 3

2 32 0) 3) 030

d , c m

t , m s

#hich of the following correctly gives the frequency and the amplitude of the wave$

frequency / H a!pl"tude / c!

A. 2.0 )0-2 2.0

B. 2.0 )0-2 ).0

. 30 2.0

!. 30 ).0

(1)

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

5

6

d i r e c t i o n o f w a v e

u p w a r d s

l e f t r i g h t

d o w n w a r d s

1n the position shown, point 5 has +ero displacement and point 6 is at a position of ma4imumdisplacement. #hich $neof the following gives the subsequent direction of motion of point 5

and of point 6$

%$"nt & %$"nt '

A. left left

B. upwards upwards

. downwards left

!. downwards upwards

(1)

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. lane wavefronts are incident on a barrier as shown below.

b a r r i e r

#hich of the following best shows the shape of the wavefronts on the other side of the barrier$

A . B .

. ! .

(1)

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1. #ave properties

%a& By reference to the energy of a travelling wave, state what is meant by

%i& a ray.

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

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

%ii& wave speed.

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

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

%b& The graph below shows the variation with time tof the displacementxA

of wave A as it

passes through a point .

. 0

2 . 0

) . 0

0 . 0

- ) . 0

- 2 . 0

- . 0

) 0 . 07 . 08 . 0( . 02 . 00 . 0 t , m sx , m mA

W a v e *

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8/12

The graph below shows the variation with time tof the displacementxBof wave B as it

passes through point .

2 . 0

) . 0

0 . 0

- ) . 0

- 2 . 0

) 0 . 07 . 08 . 0( . 02 . 00 . 0 t , m sx , m mB

W a v e +

%i& alculate the frequency of the waves.

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

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

%ii& The waves pass simultaneously through point . 9se the graphs to determine the

resultant displacement at point of the two waves at time t ).0 ms and at time t

7.0 ms.

At t ).0 ms: ...............................................................................................

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

At t 7.0 ms: ...............................................................................................

...............................................................................................(3)

(,$tal 6 !ar-)

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11. #aves on a string

A travelling wave is created on a string. The graph below shows the variation with time tof the

displacementyof a particular point on the string.

2 . 0

) . 0

0 . 0

- ) . 0

- 2 . 0

0 . 30 . (0 . 0 . 20 . )0 . 0

t , m s

/ r a p h 1 , m my

The variation with distancexof the displacementyof the string at t 0 is shown below.

2 . 0

) . 0

0 . 0

- ) . 0

- 2 . 0

0 . 30 . (0 . 0 . 20 . )0 . 0x , c m

/ r a p h 2 , m my

%a& 9se information from the graphs to calculate, for this wave,

%i& the wavelength;

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

%ii& the frequency;

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

%iii& the speed of the wave.

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

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%b& The wave is moving from left to right and has period T.

%i& "n graph 1, draw a labelled line to indicate the amplitude of the wave.(1)

%ii& "n graph 2, draw the displacement of the string at.

(

Tt=

(2)

(,$tal 7 !ar-)

12. Travelling waves

%a&


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%ii& 9se the graphs to determine the amplitude, wavelength, frequency and speed of the

wave.

Amplitude: .................................................................................................(1)

#avelength: .................................................................................................(1)

>requency: .................................................................................................

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

=peed: .................................................................................................

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

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?efraction of waves

%b& The diagram below shows plane wavefronts incident on a boundary between two media A

and B.

m e d i u m A

m e d i u m B

The ratio.(.)is

Amediumofinde4refractive

Bmediumofinde4refractive

The angle between an incident wavefront and the normal to the boundary is 30.

%i& alculate the angle between a refracted wavefront and the normal to the boundary.

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

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

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

.........................................................................................................................(3)

%ii& "n the diagram above, construct threewavefronts to show the refraction of the

wave at the boundary.(3)

(,$tal 11 !ar-)

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