Two loudspeakers placed 60 m apart are driven in phase by, Ask an Expert

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two loudspeakers placed 6.0 m apart are driven in phase by an audio oscillator, whose frequency range is 1350 Hz to 1826 Hz. A point P is located 4.9 m from one loud speaker and 3.6 m from the other. The speed of sound is 344 m/s. What is the frequency produced by the oscillator, for which destructive interference occurs at point P?

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