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 sec. What is the latent heat of fusion of the substance

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Solution

The correct option is B

Heat lost in t sec = mL or heat lost per sec = $\frac{m L}{t}$ . this must be the heat supplied for keeping the substance in molten state per sec.
$∴mLL=P or L=fracPtm$

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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 is turned off, the sample completely solidifies in time t sec. What is the latent heat of fusion of the substance

The correct option is B Heat lost in t sec = mL or heat lost per sec = mLt. this must be the heat supplied for keeping the substance in molten state per sec. ∴mLL=P or L=fracPtm

The correct option is B

Heat lost in t sec = mL or heat lost per sec = $\frac{m L}{t}$ . this must be the heat supplied for keeping the substance in molten state per sec.
$∴mLL=P or L=fracPtm$