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Discussion :: Heat and Mass Transfer

  1. When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a

    2. A.

     Black body
    B.

     Grey body
    C.

     Opaque body
    D.

     White body

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    Answer : Option A

    Explanation :

    A blackbody surface completely absorbs external irradiation, regardless of direction and wavelength distribution. Its surface absorptivity is always 1, so αλ = α = 1. The reflectivity of a blackbody is always zero.

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