Figure 17-36 shows four isotropic point sources of sound that are uniformly spaced on an
Chapter 17, Problem 20(choose chapter or problem)
Figure 17-36 shows four isotropic point sources of sound that are uniformly spaced on an x axis. The sources emit sound at the same wavelength l 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) l/4, (b) l/2, and (c) l? S1 S2 S3 S4 Figure 17-36 20.
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