In Fig. 17-46, sound of wavelength 0.850 m is emitted
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In Fig. 17-46, sound of wavelength 0.850 m is emitted isotropically by point source S. Sound ray 1 extends directly to detector D, at distance L # 10.0 m. Sound ray 2 extends to D via a reflection (effectively, a bouncing) of the sound at a flat surface. That reflection occurs on a perpendicular bisector to the SD line, at distance d from the line. Assume that the reflection shifts the sound wave by 0.500l. For what least value of d (other than zero) do the direct sound and the reflected sound arrive at D (a) exactly out of phase and (b) exactly in phase? S D d Ray 2 Ray 1 __L 2 __L 2 Figure 17-46 79.
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