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  • question_answer           Intensity of radiation at a surface in perpendicular direction is equal to:

    A) Product of emissivity of surface and \[1/\pi .\]

    B) Product of emissivity of surface and \[\pi .\]

    C) Product of emissive power of surface and \[1/\pi .\]

    D) Product of emissive power of surface and \[\pi .\]

    Correct Answer: C

    Solution :

    Intensity of radiation, \[I=E/\pi \]


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