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Cal A. Fornia, a piano tuner strikes a key and a tuning fork at the same time. The tuning fork is 440 Hz. If a

Cal A. Fornia, a piano tuner strikes a key and a tuning fork at the same time. The tuning fork is 440 Hz. If a beat frequency of 5 Hz is produced, what are the possible frequencies for the piano? Which of these is the correct frequency if tightening the string reduces the beats to zero?

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