4.) A man is watching two trains, one leaving and the other
coming in with equal speeds of 4 m s-1. If they sound their
whistles, each of frequency 240 Hz, the no. of beats per
second heard by the man is
(Velocity of sound in air = 330 m s-1)
(a) 6 (b) 3
(c) 0
(d) 12
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