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Question

The apparent frequency of the whistle of an engine changes in the ratio of 6:5 as the engine passes a stationary observer. If the velocity of sound is 330 m/s, then the velocity of the engine is
  1. 3 m/s
  2. 30 m/s
  3. 0.33 m/s
  4. 660 m/s


Solution

The correct option is B 30 m/s
v=vvvsv, v"=vv+vsvvv′′=v+vzvvs or 65=330+v330v11vs=330  vs=30 m/s

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