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

"The ratio of the total emissive power to the absorptivity for all bod

1.	"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» B. Planck's

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"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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