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 ___________.

L = \frac{P t}{M}

Joules/Kg.

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L = \frac{2 P t}{M}

Joules/Kg.

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L = \frac{3 P t}{M}

Joules/Kg.

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L = \frac{5 P t}{M}

Joules/Kg.

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Solution

The correct option is A $L = \frac{P t}{M}$ Joules/Kg.
Total heat released in t seconds $= P \times t = m L_{f u s i o n}$
$L_{f u s i o n} = \frac{P \times t}{m}$

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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 ___________.

The correct option is A L=PtMJoules/Kg.Total heat released in t seconds =P×t=mLfusionLfusion=P×tm

The correct option is A $L = \frac{P t}{M}$ Joules/Kg.
Total heat released in t seconds $= P \times t = m L_{f u s i o n}$
$L_{f u s i o n} = \frac{P \times t}{m}$