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Two loudspeakers are placed 3.00m apart. They emit 485 Hz sounds, in phase. A microphone is placed 3.20m distant from a point midway between the two speakers, where an intensity maximum is recorded. How far must the microphone be moved to the right to find the first intensity minimum?

Suppose the speakers are reconnected so that the 485 Hz sounds they emit are exactly out of phase. At what positions are the intensity maximum and minimum now?(2 answers)

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