What is Kirchhoff's law ??

Answers (1)

   According to  Kirchhoff's law, the ratio of emissive power to absorptive power is the same for all surfaces at the same temperature and is equal to the emissive power of a perfectly black body at that temperature. 

I.e  \frac{e_1}{a_1}= \frac{e_2}{a_2}......= \frac{E}{A}

And as for perfectly black body A = 1

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