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Question
Kirchhoff's law states that:
Options:
A .  The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
B .  The total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
C .  The wave length corresponding to the maximum energy is proportional to the absolute temperature
D .  All of above
Answer: Option A

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