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A source and an observer are moving towards each other with a speed equal to v2 where v is the speed of sound. The source is emitting sound of frequency n. The frequency heard by the observer will be

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a

Zero

b

n

c

n3

d

3n

answer is D.

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Detailed Solution

n'=nv+v0v−vs=n v+v/2v−v/2=3n

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