Question: Consider a diffuse surface exposed to very large surroundings. The diffuse surface has a spectral emissivity that is equal to 0 . 8 over a

Consider a diffuse surface exposed to very large surroundings. The diffuse surface has a spectral emissivity that is equal to 0.8
over a wavelength range from 0 to 4 m, and the spectral emissivity beyond 4 m is 0.25.
1. If the surface temperature is 400 K, determine the total emissivity of the surface.
2. If the surface is enclosed by very large surroundings at 1200 K, determine the total absorptivity of the surface.
3. Determine the net radiative flux from the surface to the surroundings.
4. If the total emissivity of the surface were 0.65, and the spectral emissivity of the surface was as described in the problem statement,
determine the approximate temperature of the surface

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