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Two identical loudpseakers placed 3.00m apart broadcast the same pure tone. The waves leave the speakers...

Two identical loudpseakers placed 3.00m apart broadcast the same pure tone. The waves leave the speakers in phase. A listener is originally at the
point O located 8.00m from the center of the line connecting the two speakers. The listener then moves to point P which is a perpendicular distance 0.350m from O and for the first time, she hears no sound. What is the frequency of the sound?

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