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A tuning fork produces 5 beats s^(-1) wi...

A tuning fork produces 5 beats `s^(-1)` with a sonometer
wire of length 78 cm. If the length of the wire
iscreased byy 2 cm, then there is a resonance between
the tuning fork and the wire. The frequency of the
fork is

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The correct Answer is:
276 Hz
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