A man is watching two trains, one leaving and the other coming in with equal speeds of 4 m/sec. If they sound their whistles, each of frequency 240 Hz, the number of beats heard by the man (velocity of sound in air = 320 m/sec) will be equal to
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Verified by ExpertsThe correct answer is:
A
Frequency of sound heard by the man from approaching train
Hence, number of beats heard by man per sec
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