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.

$∴ \frac{m L}{t} = p o r l = \frac{P t}{m}$

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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 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. ∴mLt=p or l=Ptm

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.

$∴ \frac{m L}{t} = p o r l = \frac{P t}{m}$