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Q.

A substance of mass m kg requires a power input of P watt to remain in the molten state at its melting point. When the power is turned off, the sample completely solidifies in time t sec. The latent heat of fusion of the substance is:

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a

Pmt

b

Ptm

c

mPt

d

tPm

answer is B.

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Detailed Solution

Equating energy supplied at time t with heat required for phase change,  mLf=Pt   ⇒   Lf=Ptm.
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