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A microphone is located on the line connecting two speakers that are 0.514 m apart and oscillating 180° out of phase. The microphone is 2.17 m from the midpoint of the two speakers. What is the lowest frequency that produces an interference maximum at the microphone's location? Use 343 m/s as the speed of sound. What is the next highest frequency that produces an interference maximum at the microphone's location?

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