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Two small speakers are located so that one is 45 cm closer to the listener than...

Two small speakers are located so that one is 45 cm closer to the listener than the other. What is the lowest possible frequency of sound produced by the speakers for which the interference is destructive at the location of the listener? (Take the speed of sound to be 343 m/s. Assume the speakers are driven by the same oscillator.)

a) 256 Hz b) 220 Hz c) 433 Hz d) 381 Hz e) 306 Hz

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