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The string of a violin a note of 400 H(Z...

The string of a violin a note of `400 H_(Z)` at its correct tension . The string is bit taut and produces `5` beats per second with a tuning fork of frequency `400 H_(Z)` . Find frequency of the note emitted by this taut string .

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The frequency of vibration of a string increases with increases in the tension . Thus, the note emitted by the string will be a little more `400h_(Z)`. As it produces `5` beats per second with the `440 H_(Z)` tuning fork, the frequency will be `405 H_(Z)` .
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