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A sound wave of frequency f propagating ...

A sound wave of frequency `f` propagating through air with a velocity `c`, is reflected from a surface which is moving away from the source with a constant speed `v`. Find the frequency of the reflected wave, measured by the observer at the position of the source.

A

`(f(c-v))/(c+v)`

B

`(f(c-v))/(c-v)`

C

`(f(c+2v))/(c+v)`

D

`(f(c-v))/(c-2v)`

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The correct Answer is:
A
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