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Q.

A source of sound is travelling towards a stationary observer. The frequency of sound heard by the observer is of two times the original frequency. The velocity of sound is  v m/s. The speed of source will be:

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a

v2

b

23v

c

3v

d

32v

answer is B.

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Detailed Solution

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n'=n(vv−vS)⇒n'n=vv−vS

⇒vv−vS=3⇒vs=2v3

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