. State Kirchhoff's law of radiation and prove it theoretically

Best Answer


According to Kirchoff’s law of radiation the emissivity of the radiating body is equal to absorptivity. Mathematically it is written as  a = e.

2. Proving it theoretically : Consider an ordinary body A and a perfectly black body B of the same dimension suspended in a uniform temperature. At thermal equilibrium both the bodies will have the same temperature.

Let E = emissive power of ordinary body A

State Kirchhoff's law

Final answer

According to kirchoff’s law of radiation a = e.

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