The phase difference between the prongs of a tuning fork is :

1.  2π  

2.  3π  

3.  π  

4.  5π

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The isothermal elasticity of a medium is Ei and the adiabatic elasticity in Ea. The velocity of sound in the medium is proportional to 

1.  Ei  

2.  Ea 

3.  Ei  

4.  Ea

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When a wave is reflected from a denser medium the change in phase is :

1.  0

2.  π 

3.  2π 

4.  3π

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In a stationary wave along a string, the strain is :

1.  zero at the antinodes

2.  maximum at the antinodes

3.  zero at the nodes

4.  maximum at the nodes

Concept Questions :-

Standing waves
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A source of sound moves away with velocitv of sound from a stationary observer. Then the frequency of the sound heard by the observer :

1. remains the same

2. is doubled

3. is halved

4. becomes infinity

Concept Questions :-

Doppler effect
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The longitudinal waves can travel :

1.  only in liquids

2.  only in solids

3.  only in gases

4.  In liquids, solids, and gases

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The equation of a wave pulse travelling along x-axis is given as y= 30 2 + x - 20t2 where . x and y are in meters and t is in seconds. The amplitude of the wave pulse is

1.  5m

2.  20m

3.  15

4.  30m

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The equation of a standing wave in a string is y = 200msin2π50x cos2π0.001t where x is in metres and t is in seconds. At the position of antinote, how many times the distance of string particle becomes 200m from the mean position in one second

1.  100 times

2.  50 times

3.  200 times

4.  400 times 

 

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Eleven tuning forks are arranged in increasing order of frequency in such a way that any two consecutive tunning forks produces 4 beats per second. The highest frequency is twice that of the lowest. The frequency is twice that of the lowest. The highest and the lowest frequencies (in Hz) are respectively

1.  100 and 50

2.  44 and 22

3.  80 and 40

4.  72 and 30

 

Concept Questions :-

Standing waves
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Consecutive frequencies emitted from an organ pipe are 75Hz, 125Hz, 175Hz, the frequency of the 10th overtone will be 

1.  275 Hz

2.  175 Hz

3.  525 Hz

4.  575 Hz

Concept Questions :-

Standing waves
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