Question: Two speakers separated by some distance emit sound waves of the same frequency, but the speakers are out of phase by 90o. Let r1 be

Two speakers separated by some distance emit sound waves of the same frequency, but the speakers are out of phase by 90o. Let r1 be the distance from some point to speaker 1 and r2 be the distance from that point to speaker 2. Find the smallest value of r2 – r1 such that the sound at that point will be

(a) Maximum, and

(b) Minimum. (Express your answers in terms of the wavelength.)

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