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Q.

A substance of mass m 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?

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a

Pmt

b

Ptm

c

mPt

d

tPm

answer is B.

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Detailed Solution

Heat lost in t sec = mL or heat lost per sec = mLt. This must be the heat supplied for keeping the substance in molten state per sec.mLt = P or L = Ptm
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