According of Kirchhoffs law______________________?

A. emissive power and absorptivity are constant for all bodies

B. ratio of emissive power to absorptive power is maximum for perfectly black body

C. ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body

D. radiant heat is proportional to fourth power of absolute temperature

E. emissive power depends on temperature

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