A turntable 150m in diameter rotates at 800rpm two speakers, Ask an Expert

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A turntable 1.50{m} in diameter rotates at 80.0{rpm}. Two speakers, each giving off sound of wavelength 30.7{cm} , are attached to the rim of the table at opposite ends of a diameter. A listener stands in front of the turntable. What is the greatest beat frequency the listener will receive from this system? Will the listener be able to distinguish individual beats?

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