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In Fig. 17-53, a point source S of sound waves lies near a reflecting wall AB. A sound detector D intercepts sound ray R1, traveling directly from S. It also intercepts sound ray R2 that reflects from the wall such that the angle of incidence θi is equal to the angle of reflection θr. Assume that the reflection of sound by the wall causes a phase shift of 0.500λ. If the distances are d1 =2.50 m. d2 = 20.0 m. and d3 = 12.5 m. what are the (a) lowest and (b) second lowest frequency at which R1, and R2 are in phase at D?
Figure 17-53 Problem 109.
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