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Question
Which of the following statement is correct?
Options:
A .  A grey body is one which absorbs all radiations incident on it.
B .  At thermal equilibrium, the emissivity and absorptivity are same.
C .  The energy absorbed by a body to the total energy falling on it, is called emissivity.
D .  A perfect body is one which is black in colour.
Answer: Option B
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