Question

The cooling curve of pure wax material after heating is shown in the figure. It first cools from $A$ to $B$ and solidifies along $BD$. The ratio of $L/C$, if $L$ and $C$ are respective values of specific latent heat of fusion and specific heat capacity of the liquid was is: (Assume rate of heat loss remain constant).

• 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, Option D