A whistle \( S \) of frequency \( f \) revolves in a circle of radius \( R \) at a constant sp...

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A whistle \( S \) of frequency \( f \) revolves in a circle of radius \( R \) at a constant speed \( v \). What is the ratio of maximum and minimum frequency detected by a detector \( D \) at rest at a distance \( 2 R \) from the centre of circle as shown in figure? (Take \( c \) as speed of sound)
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(a) \( \left(\frac{c+v}{c-v}\right) \)
(b) \( \sqrt{2}\left(\frac{c+v}{c-v}\right) \)
(c) \( \sqrt{2} \)
(d) \( \frac{(c+v)}{c \sqrt{2}} \)
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