Physics-
General
Easy

Question

A car travelling at a speed of 54 km/hr towards a large wall horns a sound of frequency 400 Hz. A person standing between the car and the wall recieves sounds one directly from the car and the other reflected from the wall. The number of beats heard by him per second are

  1. 8    
  2. 6    
  3. 3    
  4. zero    

The correct answer is: zero

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