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Q.

A tuning fork resonates with a sonometer wire of length 1 m stretched with a tension of 6 N. When the tension in the wire is changed to 54 N, the same tuning fork produces 12 beats per second with it. The frequency of the tuning fork is _______ Hz.

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answer is 6.

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Detailed Solution

f=12 LTμ

f1=126μ          f2=1254μ

f1f2=13                f2-f1=12

f1=6HZ

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