The spectral, hemispherical absorptivity of an opaque surface and the spectral distribution of radiation incident on the surface are as shown in the following figures, where 1 is in um and Go is in W/m2.um. What is the total, hemispherical absorptivity of the surface? If it is assumed that En = a, and that the surface is at 500 K, what is its total, hemispherical emissivity? 0.9 0.8 0.7 0.6 0.5 0.4 8 0.3 0.2 0.1 0 0 1 2 3 4 5 6 7 8 λ 6000 5000 4000 б 3000 2000 1000 0 0 1 2 3 4 5 6 7 8 λ
