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Two loudspeakers that emit sound of 686 Hz, but 900 out of phases are placed along...

Two loudspeakers that emit sound of 686 Hz, but 900 out of phases are placed along walls on the opposite sides of a gym and are separated by a
distance of 25.00m. (I)If Janet starts walking from one speaker towards the other speaker, how far does she have to walk before she hears the first
constructive interferences? (II) What is the phase difference when she is midway between the two speakers? The speed of sound in air is
343.0m/s.

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