Three sources of sound S1 S2 and S3 of equal intensity are placed in a straight line with S1S2 = S2S3 (figure 16-E5). 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?
