In Fig. 17-37, sound with wavelength ? travels rightward from a source and throu

Question

In Fig. 17-37, sound with wavelength ? travels rightward from a source and through a tube that consists of a straight portion and a half-circle. Part of the sound wave travels through the half-circle and then rejoins the rest of the wave, which goes directly through the straight portion. This rejoining results in interference. What is the smallest radius r that results in an intensity minimum at the detector? State your answer in terms of the given variables using vs for the speed of sound and ? if necessary.

Explanation / Answer

r-2r=/2

r=/[2*(-2)]

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