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A piano tuner hears one beat every 2.8 s when trying to adjust two strings, one of which is sounding 440 Hz, so that they sound the same tone. How far off in frequency is the other string?

  • physics -

    The "beat frequency" is 1/2.8 = 0.357 Hz. That is also how far the second string is off the desired 440 Hz.

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