The figure below shows four isotropic point sources of sound that are uniformly

Question

The figure below shows four isotropic point sources of sound that are uniformly spaced on an x axis. The sources emit sound at the same wavelength ? 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) 0.5?, (b) 1?, and (c)2??

The figure below shows four isotropic point sources of sound that are uniformly spaced on an x axis. The sources emit sound at the same wavelength ? 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) 0.5?, (b) 1?, and (c)2??

Explanation / Answer

a) 0.5+1+1.5 = 3

b) 1+ 2+ 3 = 6

c) 2+ 3 +4 = 9

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