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[" 55.A man standing on a platform obser...

[" 55.A man standing on a platform observes that the "],[" frequency of the sound of a whistle emitted by a "],[" train drops by "140Hz" .If the velocity of sound in "],[" air is "330m/s" and the speed of the train is "],[70m/s" ,the frequency of the whistle is "],[[" (1) "571Hz," (4) "800Hz],[" (3) "400Hz," (4) "260Hz]]

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A man standing on a platform observes that the frequency of the sound of a whistle emitted by a train drops by 140 Hz. If the velocity of sound in air is 330 m/s and the speed of the train is 70 m/s, the frequency of the whistle is

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