The variations of the spectral emissivity of two surfaces are as given in Fig. P21€“42. Determine the average emissivity of each surface at T = 3000 K. Also, determine the average absorptivity and reflectivity of each surface for radiation coming from a source at 3000 K. Which surface is more suitable to serve as a solar absorber?

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1.0 0.9 (1) 0.8 0.5 0.2 0.1 2, um 3.