A substance of mass M kg rquires 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 solidifes in time t second .the latent heat of fusion of the substance is .................

Question

A substance of mass M kg rquires 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 solidifes in time t second .the latent heat of fusion of the substance is ................. (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Heat lost in time t = Pt = ML ⇒ ∴ L=(Pt/M)

Q. A substance of mass M kg rquires 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 solidifes
in time t second .the latent heat of fusion of the substance is
.................

Heat lost in time t = Pt = ML $\Rightarrow ∴ L = \frac{Pt}{M}$

Q. A substance of mass M kg rquires 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 solidifes in time t second .the latent heat of fusion of the substance is .................

Heat lost in time t = Pt = ML ⇒∴L=MPt​

Q. A substance of mass M kg rquires 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 solidifes
in time t second .the latent heat of fusion of the substance is
.................

Heat lost in time t = Pt = ML $\Rightarrow ∴ L = \frac{Pt}{M}$