1.

A substance of mass m kg requires a power input of P watts to remain in the molten state at its melting point. When the power is turned off, the sample completely solidifies in time t sec. What is the latent heat of fusion of the substance  [IIT JEE 1992]

A.            \[\frac{Pm}{t}\]                  
B.            \[\frac{Pt}{m}\]
C.            \[\frac{m}{Pt}\]                  
D.            \[\frac{t}{Pm}\]
Answer» C.            \[\frac{m}{Pt}\]                  


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