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Discussion :: Heat and Mass Transfer

  1. 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is

    2. A.

     0.45
    B.

     0.55
    C.

     0.40
    D.

     0.75

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    Answer : Option A

    Explanation :

    a + p + T = 1 a + 0.40 + 0.15 = 1 (p = 0.40, T = 0.15) a = 1 - 0.55 a = 0.45

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