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

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

Answer 1

Correct Answer - D
Let the quantity of heat supplied per minute be Q, then quantity of heat supplied in 2min = mc(90-80)
In 4min, heat supplied = 2mc(90-80)
`therefore` 2mc(90-80) = mL
`rArr` L/c = 20