A train approaching a platform sounds a frequency 500 Hz lasting for duration of 20s If a man at the platform observes the

Question

A train approaching a platform sounds a frequency 500 Hz lasting for duration of 20s If a man at the platform observes the frequency of the whistle to be 550 Hz Find the duration At for which he hears the sound of the whistle velocity of sound in air 330m s Then At is Your Answer 10 Answer 18 18 S

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