First slide

Calorimetry

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. lf L and C arc respective values of latent heat and the specific heat of the liquid wax, the ratio L/C is

Moderate

A

40
B

80
C

100
D

20

Solution

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

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