(Answered) Two loud speakers in a plane 20 m apart and in phase with

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Two loud speakers in a plane 2.0 m apart and in phase with each other. Both emit 700hz sound waves into a room where the speed of sound is 341 m/s a listener stand 5 m in front of the loud speakers and 2.0 m to the side of the center. Is the interference at this point max con, max dest, or between? How will the situation differ if the loudspeakers are out of phase

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