While attempting to tune the note c at 532 hz, a piano, Ask an Expert

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While attempting to tune the note C at 532 Hz, a piano tuner hears 5 beats/s between a reference oscillator and the string.

(a) What are the possible frequencies of the string?

(b) When she tightens the string slightly, she hears 6 beats/s. What is the frequency of the string now?

(c) By what percentage should the piano tuner now change the tension in the string to bring it into tune? (Give a positive answer for an increase in the tension, or a negative answer for a decrease in the tension.)

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