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A whistle 'S' of frequency v revolves in...

A whistle 'S' of frequency v revolves in a circle of radius R at a constant speed v. what is the ratio of the largest and smallest frequency detected by a detector D, at rest, at a distance 2 R from the centre of the circle as shown in the figure? (take speed of sound in air as c)

A

`(c+V)/(c-V)`

B

`sqrt(2)((c+V)/(c-V))`

C

`sqrt(2)`

D

`(c+V)/(sqrt(2)c)`

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The correct Answer is:
A
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