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 will it take to solidify it completely?

MLP

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Solution

The correct option is B

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 the substance to get completely solidified.

The energy lost by the substance is E = Pt

Thus, the quantity of heat required to keep the substance solidified is

Q = ML

Hence, ML = Pt

So, t = ML/P

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M

kilograms of a material are to be kept in melted state at melting point and power required for this purpose is

P

. When power source is disconnected then the sample completely solidifies in

t

sec. The latent heat of fusion of the material will be :

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