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What is Kirchhoff's law ??

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   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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