Question: Two speakers, which are in phase with one another, broadcast identical sound waves at a frequency of 1 7 0 Hz . Assume the speed

Two speakers, which are in phase with one another, broadcast identical sound waves at a frequency of 170 Hz. Assume the speed of sound to be 340 m/s. The speakers are pointed at one another. Speaker A is positioned at x =0 m, and speaker B is located at x =+20.40 m.
In between the speakers, there are a few locations at which the two waves produce completely destructive interference. What is the x-coordinate of the point closest to speaker B at which completely destructive interference occurs?

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