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Discussion :: Heat and Mass Transfer

  1. The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

    2. A.

     Wien's law
    B.

     Stefan's law
    C.

     Kirchhoff's law
    D.

     Planck's law

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    Answer : Option C

    Explanation :

    Kirchhoff's law states that the emissivity and the absorptivity of a surface at a given temperature and wavelength are equal.
    The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as Kirchhoff's law

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