A man standing on a platform observes that the \( \mathrm{P} \) fre...

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A man standing on a platform observes that the
\( \mathrm{P} \) frequency of the sound of a whistle emitted by a

W train drops by \( 140 \mathrm{~Hz} \). If the velocity of sound in air is \( 330 \mathrm{~m} / \mathrm{s} \) and the speed of the train is \( 70 \mathrm{~m} / \mathrm{s} \), the frequency of the whistle is
(1) \( 571 \mathrm{~Hz} \)
(2) \( 800 \mathrm{~Hz} \)
(3) \( 400 \mathrm{~Hz} \)
(4) \( 260 \mathrm{~Hz} \)
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