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  4. The figure given below shows the cooling curve of pure wax material after heating. It cools from A to B and solidifies along B D. If L and C are respective values of latent heat and the specific heat of the liquid wax, the ratio L / C is </br><img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/9f6f0aa4f9d716b6da6f9c07830fdea7-.png />

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

Thermal Properties of Matter

Solution:

Let the quantity of heat supplied per minute be $Q$.
Then quantity of heat supplied in $2 \,\min =m C(90-80)$
In $4 \,\min$, heat supplied $=2 m C(90-80)$
$\therefore 2 m C(90-80)=m L $
$\Rightarrow \frac{L}{C}=20$