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A sonometer wire is stretched by a solid...

A sonometer wire is stretched by a solid mass M. It produces a fundamental note of a certain frequency in tune with a tuning fork when its length is `70` cm. When the mass is immersed in water it is found that the length has to be changed by 5 cm in order to bring it in tune with the same tuning fork. Calculate the relative density of the material of the hanging mass.

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