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Two piano strings are supposed to be vibrating at 220 hz, but a piano tuner hears three beats every 2.5 s when they are played together.
(a) if one is vibrating at 220.0 hz, what must be the frequency of the other (is there only one answer)?
(b) by how much (in percent) must the tension be increased or decreased to bring them in tune?
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Answers: 3
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