The figure shows four isotropic point sources of sound that are uniformly spaced on an x axis. The sources emit sound at the same wavelength A and same amplitude sm: and they emit in phase. A point P is shown on the x axis. Assume that as the sound waves travel P, the decrease in their amplitude is negligible. What multiple of sm is the amplitude of the net wave at P if distance d in the figure is (a)1A, (b)2A, and (c)4A? Sa (a) Number i 45 Units (b) Number 45 Units (c) Number 45 Units m
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