two small stereo speakers are driven in step by the same variable-frequency osci

Question

two small stereo speakers are driven in step by the same variable-frequency oscillator. their sound is picked up by a microphone arranged as shown in the figure. assume that the speed of sound is 344 m/s.

the speakers are 2.00 m apart and their sound is 4.50 m from the microphone

A) for what frequencies does their sound at the speakers produce constructive interference?
express your answer in terms of n(an integer factor).

B) for what frequencies does their sound at the speakers produce destructive interference?
express your answer in terms of n (an integer factor).

Explanation / Answer

Are the speakers and the microphone on a straight line? The figure is needed :(

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