Question
A substance of mass M kg requires an input power P to keep it in molten state. If the latent heat of fusion of substance is L, then how long it will take to solidify it completely?
Solution
If the power P is required to keep the substance in molten state, then the radiant power of substance is P.
Let t be the time taken by substance to completely solidify the substance.
The energy lost by substance is,
E = Pt
The quantity of heat to be lost to solidify the substance is,
Q = ML
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ML = Pt
, is the required time to solidify the substance completely.
Let t be the time taken by substance to completely solidify the substance.
The energy lost by substance is,
E = Pt
The quantity of heat to be lost to solidify the substance is,
Q = ML
ML = Pt, is the required time to solidify the substance completely. 
