The relation between the emissive and absorptive power of a surface is developed under
A)Electrical analogy
B)Stefan-Baltzmann's law
C)Planck's law
D)Kirchhoff's law
E)Law of radiations

Question

Quizplus · Accepted Answer

Kirchhoff's law states that for a body in thermal equilibrium, the emissivity of a body (or surface) equals its absorptivity. This principle is fundamental in understanding the relation between the emissive and absorptive powers of surfaces.

The Relation Between the Emissive and Absorptive Power of a Surface