Consider an opaque, diffuse surface for which the spectral absorptivity and irradiation are as follows:

What is the total absorptivity of the surface for the prescribed irradiation? If the surface is at a temperature of \(500 \mathrm{~K}\), what is its emissive power? How will the surface temperature vary with time, for the prescribed conditions?

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0.8 0.4 G(W/m.m) 5000 0 0 1 2 3 45 0 () 24 6 8 10 (um)