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Two guitar strings, X and Y, are plucked at the same instant, and a beat frequency of 4 Hz is heard. Then, the tension in

Two guitar strings, X and Y, are plucked at the same instant, and a beat frequency of 4 Hz is heard. Then, the tension in Y is increased and the new beat frequency is 1 Hz. If X has a frequency of 220 Hz, the original frequency of Y was

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