Two loudspeakers on a concert stage are vibrating in phase. A listener is 57 m from the left speaker and 30 m from the right one.

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Two loudspeakers on a concert stage are vibrating in phase. A listener is 57 m from the left speaker and 30 m from the right one. The listener can respond to all frequencies from 20 to 20 000 Hz, and the speed of sound is 343 m/s. What are the two lowest frequencies that can be heard loudly due to constructive interference?

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