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Two speakers, which are separated by a distance d, produce sound waves with the same amplitude,...

Two speakers, which are separated by a distance d, produce sound waves with the same amplitude, phase and frequency. The frequency of the sound is 570 Hz. You stand a distance of 3.50 m directly in front of the left speaker, on the dashed line shown in the diagram. Assume the speed of sound to be 340 m/s. What is the smallest possible value of d so that you hear no sound because of destructive interference?

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