The longitudinal waves can travel :

1.  only in liquids

2.  only in solids

3.  only in gases

4.  In liquids, solids, and gases

Subtopic:  Types of Waves |
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The equation of a wave pulse travelling along x-axis is given by y=302+x-20t2, x and y are in meters and t is in seconds. The amplitude of the wave pulse is 

1.  5 m

2.  20 m

3.  15 m

4.  30 m

Subtopic:  Wave Motion |
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The equation of a standing wave in a string is y=200msin2π50xcos2π0.01t where x is in meters and t is in seconds. At the position of antinode, how many times does the distance of a string particle become 200 m from its mean position in one second?

1.  100 times

2.  50 times

3.  200 times

4.  400 times 

Subtopic:  Standing Waves |
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Eleven tuning forks are arranged in increasing order of frequency in such a way that any two consecutive tuning forks produce 4 beats per second. The highest 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

Subtopic:  Beats |
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Consecutive frequencies emitted from an organ pipe are 75Hz, 125Hz, 175Hz.  The frequency of the tenth overtone will be:

1.  275 Hz

2.  175 Hz

3.  525 Hz

4.  575 Hz

Subtopic:  Standing Waves |
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The sound intensity level at a point 10 m away from a point source is 20dB, then the sound level at a distance 1m from the same source would be

(1) 40 dB

(2) 30 dB

(3) 200 dB

(4) 100 dB

Subtopic:  Wave Motion |
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In the phenomenon of interference of sound by two coherent sources if difference of intensity at maxima to intensity at minima is 20dB, then the ratio of intensities of the two sources is

1.  12181

2.  119

3.  10199

4.  101

Subtopic:  Wave Motion |
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When a sound wave travels from one medium to another, the quantity that remains unchanged is :

1.  speed

2.  amplitude

3.  frequency

4.  wavelength

Subtopic:  Wave Motion |
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If a sound source of frequency n approaches an observer with velocity v/4 and the observer approaches the source with velocity v/5, then the apparent frequency heard will be-

1.  (5/8)n

2.  (8/5)n

3.  (7/5)n

4.  (5/7)n

 

Subtopic:  Doppler's Effect |
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The equation of plane progressive wave motion is y=a sin 2π/λ(vt-x). Velocity of particle is

(1) ydvdx

(2) vdydx

(3) -ydvdx

(4) -vdydx

Subtopic:  Speed of Sound |
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