A rod of mass 'M' and length '2L' is sus...

A rod of mass 'M' and length '2L' is suspended at its middle by a wire. It exhibits torsional oscillations, if two masses each of 'm' are attached at distance` 'L//2' ` from its centre on both sides, it reduces the oscillation frequency by `20%`. The value of ratio `m//M` is close to :

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