A substance of mass $M$ requires a power input of $P$ watts to ramain in the molten state at its melting point. When the power source is turned off, the sample completely solidifies in time $t$ sec. The specific latent heat of fusion of the substance is:

P t

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\frac{P t}{M}

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P t M

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\frac{P M}{t}

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Solution

The correct option is B $\frac{P t}{M}$
Power, $P = \frac{Q}{t} = \frac{m L}{t}$ we know that, $(Q = m \times l)$
Now $\Rightarrow l = \frac{P t}{M}$
$T h u s l = \frac{P t}{M}$

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A substance of mass M requires a power input of P watts to ramain in the molten state at its melting point. When the power source is turned off, the sample completely solidifies in time t sec. The specific latent heat of fusion of the substance is:

The correct option is B PtMPower, P=Qt=mLt we know that, (Q=m×l)Now ⇒l=PtMThusl=PtM

A substance of mass $M$ requires a power input of $P$ watts to ramain in the molten state at its melting point. When the power source is turned off, the sample completely solidifies in time $t$ sec. The specific latent heat of fusion of the substance is:

The correct option is B $\frac{P t}{M}$
Power, $P = \frac{Q}{t} = \frac{m L}{t}$ we know that, $(Q = m \times l)$
Now $\Rightarrow l = \frac{P t}{M}$
$T h u s l = \frac{P t}{M}$