Q.

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

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a

40

b

80

c

100

d

20

answer is D.

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Detailed 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)∴2mC(90−80)=mL⇒LC=20
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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