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Discussion :: Heat and Mass Transfer

  1. Absorptivity of a body will be equal to its emissivity

    2. A.

     At all temperatures
    B.

     At one particular temperature
    C.

     When system is under thermal equilibrium
    D.

     At critical temperature

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    Answer : Option C

    Explanation :

    Kirchhoff's law states that For an arbitrary body emitting and absorbing thermal radiation in thermodynamic equilibrium, the emissivity is equal to the absorptivity.

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