Question

The figure given below shows the cooling curve of pure wax material after heating. It cools from $A$ to $B$ and solidifies along $BD$. If $L$ and $C$ are respective values of latent heat and the specific heat of the liquid wax, the ratio $L/C$ is $v$

• A. $40$
• B. $80$
• C. $100$
• D. $20$

Answer 1

The correct option is D $20$

Let the quantity of heat supplied in $2min=mC(90-80)$

The quantity of heat supplied in $4min=2mC(90-80)$

$\therefore 2mC(90-80)=mL$

$\Rightarrow \frac{L}{C}=2(90-80)=20$

$\therefore \frac{L}{C}=20$

Hence, this is the answer.