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Two speakers S subscript 1 end subscript & S subscript 2 end subscript driven by the same amplifiers are placed at y=1m and y=-1m The speakers vibrate in phase at 600 Hz A man stands at a point on x-axis at a very large distance form the origin and starts moving parallel to y-axis The speed of sound in air is 330 m/s If he continous to walk along the same line how many more maxima can he hear

  1. one    
  2. two    
  3. 5    
  4. 10    

The correct answer is: two

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