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