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Q.

Two objects A and B have same shape and area. The Emissivity of A is 0.2 and that of B is 0.8. Each radiates  same power. The ratio of their absolute temperatures is

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a

2 : 1

b

1 : 4

c

1 : √2

d

√2 : 1

answer is D.

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Detailed Solution

From the surface of a hot body, power radiated is P = eσAT4eA = 0.2, eB = 0.8,
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