Heat and Thermodynamics 1 Question 20
20. 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 source is turned off, the sample completely solidifies in time $t$ seconds. The latent heat of fusion of the substance is ……. .
(1992, 1M)
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Solution:
- Heat lost in time $t=P t=M L \Rightarrow \therefore L=\frac{P t}{M}$
