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Standard XII
Physics
Latent Heat
Question

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 is turned off, the sample completely solidifies in time t second. What is the latent heat of fusion of the substance?
  1. Pmt
  2. Ptm
  3. mPt
  4. tPm

A
Pmt
B
Ptm
C
mPt
D
tPm
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Solution
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Power=θTθ=mass×latentheatθ=mlP=MLT⇒l=ptm

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