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Question

A train A crosses a station with a speed of 40 m/ s and whistles a short pulse of natural frequency n subscript 0 end subscript equals 596 H z. Another train B is approaching towards the same station with the same speed along a parallel track. Two tracks are d = 99m apart. When train A whistles, train B is 152m away from the station as shown in fig. If velocity of sound in air v equals 330 m divided by s, calculate frequency of the pulse heard by driver of train B

  1. 724 Hz    
  2. 660 Hz    
  3. 742 Hz    
  4. 427 Hz    

The correct answer is: 724 Hz

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