Question

A solid material is being supplied heat at a constant rate. The temperature of material is changing with heat input as shown in the figure. What does the slope of $\text{DE}$ represent ?

• A. Latent heat of liquid
• B. Latent heat of vaporization
• C. Heat capacity of vapour
• D. Inverse of heat capacity of vapour

Answer 1

The correct option is D Inverse of heat capacity of vapour

Since, initially material is in solid state, so the graph indicates following process

We know that,

$dQ=CdT$

$\Rightarrow \frac{dT}{dQ}=\frac{1}{C}$ = Slope of temperature - heat curve

So, for curve $\text{DE},$

$\Rightarrow \frac{dT}{dQ}=$ Inverse of heat capacity of vapour.

So, $\left(d\right)$ is correct choice.