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Speakers A and B are vibrating in phase. They are directly facing each other, are 8.6...

Speakers A and B are vibrating in phase. They are directly facing each other, are 8.6 m apart, and are each playing a 79.0 Hz tone. The speed of sound is 343 m/s. On the line between the speakers there are three points where constructive interference occurs. What is the distance of the farthest point from speaker A? m

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