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How far must they go or the observer be

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A pair of speakers separated by distance d = 0.600 m are driven by the same oscillator at a frequency of 676 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. (Use v = 343 m/s.)

image
(a) How far must the observer walk before reaching a relative maximum in intensity? 
 m 

(b) How far will the observer be from the speaker when the first relative minimum is detected in the intensity? 
 m
asked Dec 15, 2017 in Physics by shahemaabdelhady (400 points)

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