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  4. At a definite temperature for a given wavelength the ratio of emissive power of all objects and that of perfectly black body at the same temperature is called as :

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Q. At a definite temperature for a given wavelength the ratio of emissive power of all objects and that of perfectly black body at the same temperature is called as :

Rajasthan PMTRajasthan PMT 1997

Solution:

According to Kirchhoff at a given temperature for a given wavelength ratio of emissive power of all objects at that of perfectly black body is emissivity.