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A pair of speakers separated by 0.700 m are driven by the same oscillator at a frequency of 674 Hz.

A pair of speakers separated by 0.700 m are driven by the same oscillator at a frequency of 674 Hz. An observer, originally positioned at one of the speakers, begins to walk along a line perpendicular to the line joining the speakers. (Assume the speed of sound is 345 m/s.)
(a) How far must the observer walk before reaching a relative maximum in intensity?

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