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Q.

Two objects A & B have exactly the same shape and are radiating the same power. If their temperatures are in the ratio 3:1then the ratio of their emissivities is.

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a

3 : 1

b

9 : 1

c

1: 9

d

1 : 3

answer is A.

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P=eσAT4⇒e1e2=T2T14

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