Consider an opaque, diffuse surface for which the spectral absorptivity and irradiation are as fol1ows: What is the total absorptivity of the surface for the prescribed irradiation? If the surface is at a temperature of 1250 K, what is its emissive power? How will the surface temperature vary with time, for the prescribed conditions?

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5000 0.8 0.4 O 1 2 3 4 5 2 (um) 2 4 6 8 10 a (um) (wrt. wmio