Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning - Discussion


Kirchhoff's law states that

[A]. the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
[B]. the wave length corresponding to the maximum energy is proportional to the absolute temperature
[C]. 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
[D]. none of the above

Answer: Option C


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