A whistle revolves in a circle with an angular speed of \( 20 \math...

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A whistle revolves in a circle with an angular speed of \( 20 \mathrm{rad} / \mathrm{sec} \) using a string of length \( 50 \mathrm{~cm} \). If the frequency of
\( \mathrm{P} \) sound from the whistle is \( 385 \mathrm{~Hz} \), then what is the minimum frequency heard by an observer, which is far away from the
W centre in the same plane \( (v=340 \mathrm{~m} / \mathrm{s}) \quad \) [CBSE PMT 2002]
(a) \( 333 \mathrm{~Hz} \)
(b) \( 374 \mathrm{~Hz} \)
(c) \( 385 \mathrm{~Hz} \)
(d) \( 394 \mathrm{~Hz} \)
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