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A sonometer wire vibrating in first over...

A sonometer wire vibrating in first overtone has length of `31.25cm`. Tensio in the wire is `256N` and mass per unit length is `10gm//m`. When it is sounded together with a tuning fork `10` beats are heard. If tension in the wire is slightly increased no beats are heard. What is the possible frequency of the tuning fork ?

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