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Q. |
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» B. Kirchhoff's law |
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