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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 to
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
45
Units
m
(b) Number
45
Units
(c) Number
45
Units
m

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