Question

"The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium". This is __________ law.

a.

Kirchoffs

b.

Planck's

c.

Wien's displacement

d.

Stefan-Boltzman

Answer: (a).Kirchoffs

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Q. "The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium". This is __________ law.

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