Question

A heating curve has been plotted for a solid object as shown in the figure. If the mass of the object is $200g$, then latent heat of vaporization for the material of the object is $\frac{n}{2}\times 10^{6}J/kg$. If power supplied to the object is constant and equal to $1kW$, then find the value of $n$.

Answer 1

Answer: 9

Heat used for evaporation $=900kJ$
Mass evaporated $=0.2kg$
$\therefore L_v=\frac{900\times 10^3}{0.2}J/kg$