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Q.

A source of frequency 512 c.p.s. moves towards a listener with a speed.of 100 m/sec. If the velocity of sound in ah is 350 m/sec, the frequency heard bylistener is

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a

7168sec-1

b

7.168 sec -1

c

716 .8sec-1

d

71.68 sec-1

answer is C.

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Detailed Solution

n′=VV−Vsn ∴ n′=350350−100512 =350×512250=716⋅8Hz
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A source of frequency 512 c.p.s. moves towards a listener with a speed.of 100 m/sec. If the velocity of sound in ah is 350 m/sec, the frequency heard bylistener is