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Discussion :: Heat and Mass Transfer

  1. The emissivity for a black body is

    2. A.

     0
    B.

     0.5
    C.

     0.75
    D.

     1

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    Answer : Option D

    Explanation :

    Real materials emit energy at a fraction—called the emissivity—of black-body energy levels. By definition, a black body in thermal equilibrium has an emissivity of ε = 1.

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