Two plates, one with a black painted surface and the other with a special coating (chemically oxidized copper) are in earth orbit and are exposed to solar radiation. The solar rays make an angle of 30° with the normal to the plate. Estimate the equilibrium temperature of each plate assuming they are diffuse and that the solar flux is 1353 W/m2. The spectral absorptivity of the black painted surface can be approximated by αλ = 0.95 for 0 < λ < 3μm and that of the special coating by αλ = 0.95 for 0 < A < 3μm and αλ = 0.05 for λ > 3μm.