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Question

Two trains, one coming towards and another going away from an observer both at 4 m/s produce a whistle simultaneously of frequency 300 Hz. The number of beats heard by observer will be (velocity of sound = 340 m/s)
  1. 5
  2. 6
  3. 12
  4. 7


Solution

The correct option is D 7
Number of beats =f(vvvs)f(vv+vs)2fvsv2       (vs<<v)
=2×300×43407

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