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Three sources of sound S1,S2 and S3 of equal intensity 'I' are placed in a straight line with S1S2=S2S3. At a point P, far away from the sources, the wave coming from S2 is 120 ahead in phase of that from S1. Also, the wave coming from S3 is 120° ahead of that from S2. What would be the resultant intensity of sound at P?


  1. 3I

  2. 2l

  3. 0


Solution

The correct option is D

0



Because the 3 sources have equal intensity, amplitudes are equal

As shown in the figure, amplitude of the resultant = 0 (vector method)

So, the resultant, intensity at P is zero.

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