A substance of mass M kg requires a powe...

A substance of mass M kg requires a power input of P wants to remain in the molten state at its melting point. When the power source is turned off, the sample completely solidifies in time t seconds. The latent heat of fusion of the substance is …….

`2 Pt//M`

`Pt//2M`

`Pt//M`

`PM//t`

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