Q.

What relation between emissivity, e, and Absorptive Power, a, is given by Kirchhoff’s law?

A. e < a
B. e > a
C. e = a
D. no specific relation
Answer» C. e = a
Explanation: kirchhoff’s law states that for any object the emissivity is always equal to absorptive power. for a black body, both of them are equal to one.
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