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A person is observing two trains; one is approaching him with a velocity of 4 ms'1, while the other is receding from him with the same velocity. If both the trains blow their respective whistles of frequency 240 hertz, the beat frequency heard by the observer will be (speed of sound in air = 320 ms'1)

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A person is observing two trains; one is approaching him with a velocity of 4 ms'1, while the other is receding from him with the same velocity. If both the trains blow their respective whistles of frequency 240 hertz, the beat frequency heard by the observer will be (speed of sound in air = 320 ms'1)






 
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