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  3. RAJASTHAN PMT

RAJASTHAN PMT Rajasthan - PMT Solved Paper-1997

  • question_answer
    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 :

    A)  relative emissivity

    B)  emissivity

    C)  absorption coefficient

    D)  reflection coefficient

    Correct Answer: B

    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.


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