Question two loudspeakers on a concert stage are vibrating, Ask an Expert

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Question: Two loudspeakers on a concert stage are vibrating in phase. A listener is 47.3 m from the left speaker and 32.1 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.

Part A: What is the lowest frequency that can be heard loudly due to constructive interference?

I need expert help to find the lowest frequency that can be heard loudly.

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