A pair of speakers separated by distance d = 0.790 m are driven by the same osci

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A pair of speakers separated by distance d = 0.790 m are driven by the same oscillator at a frequency of 672 Hz. An observer originally positioned at one of the speakers begins to walk along a line perpendicular to the line joining the speakers as in the figure below.

A pair of speakers separated by distance d = 0.790 m are driven by the same oscillator at a frequency of 672 Hz. An observer originally positioned at one of the speakers begins to walk along a line perpendicular to the line joining the speakers as in the figure below. How far must the observer walk before reaching a relative maximum in intensity? How far will the observer be from the speaker when the first relative minimum is detected in the intensity?

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and

interference of mechanical waves...

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