Heat and Thermodynamics 1 Question 20

20. A substance of mass Mkg 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:

  1. Heat lost in time t=Pt=ML⇒∴L=PtM


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