In the figure, two speakers separated by distance d1 = 2.40 m are in phase. You are standing 4.70 m directly in front of one speaker. Each speaker has an output power of 1.20 W. Because the speakers are at different distances, there will be frequencies at which the sound from the speakers interferes destructively. But because the speakers are at different distances, the sound intensities will not be the same, so the destructive interference will not be complete. We want to find the sound level when there is destructive interference. Use 343 m/s for the speed of sound in air.
(a) What is the lowest frequency that gives minimum signal (destructive interference) at your ear
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