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Q.

A boy is walking away from a wall towards an observer at a speed of 1 metre/sec and blows a whistle whose frequency is 680 Hz. The number of beats heard by the observer per second is (Velocity of sound in air = 340 metres/sec

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a

Zero

b

2

c

8

d

4

answer is D.

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Detailed Solution

Observer hears two frequencies (i)  n1 which is coming from the source directly(ii)  n2 which is coming from the reflection image of sourceso, n1=680340340−1 and n2=680340340+1⇒n1−n2=4 beats
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A boy is walking away from a wall towards an observer at a speed of 1 metre/sec and blows a whistle whose frequency is 680 Hz. The number of beats heard by the observer per second is (Velocity of sound in air = 340 metres/sec