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Discussion :: Heat and Mass Transfer

  1. Emissivity of a white polished body in comparison to a black body is

    2. A.

     Higher
    B.

     Lower
    C.

     Same
    D.

     Depends upon the shape of body

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    Workspace

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    Answer : Option B

    Explanation :

    White body reflects all incident radiation;
    i.e., its absorptivity is zero.
    Accordingly, its emissivity is also zero.
    So any black or even "grey" body will have a higher emissivity,

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