1. Tardigrade
  2. Question
  3. Physics
  4. A substance of mass M kg rquires 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 solidifes in time t second .the latent heat of fusion of the substance is .................

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Q. A substance of mass M kg rquires 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 solidifes
in time t second .the latent heat of fusion of the substance is
.................

IIT JEEIIT JEE 1992Thermodynamics

Solution:

Heat lost in time t = Pt = ML $\Rightarrow \, \, \, \, \, \, \, \therefore \, \, \, L=\frac{Pt}{M}$