In Fig. 17-45, sound waves A and B, both of wavelength l, are initially in phase and
Chapter 17, Problem 77(choose chapter or problem)
In Fig. 17-45, sound waves A and B, both of wavelength l, are initially in phase and traveling rightward, as indicated by the two rays. Wave A is reflected from four surfaces but ends up traveling in its original direction. What multiple of wavelength l is the smallest value of distance L in the figure that puts A and B exactly out of phase with each other after the reflections? ABFigure 17-45 77.
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