A stretched wire of 70cm length fixed at one end has a solid mass M, hanging from its other end to produce tension in it. The wire produces a certain frequency. When the same mass 'M' hang in water, it is found that the length of the wire has to be changed by 5 cm. in order to produce the same frequency. Then the density of the material of mass 'M' is
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A stretched wire of 70cm length fixed at one end has a solid mass M, hanging from its other end to produce tension in it. The wire produces a certain frequency. When the same mass 'M' hang in water, it is found that the length of the wire has to be changed by 5 cm. in order to produce the same frequency. Then the density of the material of mass 'M' is