Engineering :: Thermodynamics

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The rate of radiant energy, which is emitted by a surface at any temperature and in small wavelengths is found from the known rate of energy, which under the same conditions would be emitted from a black surface, by multiplying with the absorptivity. Above enunciation is known as

[A].	Planck's law	[B].	Kirchhoff's law
[C].	Stefan Bolzmann's law	[D].	Lambart's rule
[E].	None of the above

Answer: Option B

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