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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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

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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

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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

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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

 

Concept Questions :-

Doppler effect
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The extension in a string, obeying Hook's law, is x. The speed of sound in the stretched string is v. If the extension in the string is increased to 1.5x, the speed of sound will be-

1.  1.22 v

2.  0.61 v

3.  1.50 v

4.  0.75 v

Concept Questions :-

Speed of sound
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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

Concept Questions :-

Speed of sound
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