Engineering, 11.07.2019 04:20 tfyvcu5344
The emissivity of a surface is 0.15 for radiation at wavelengths less than 3 μm and 0.9 for radiation at wavelengths greater than 3 μm. a)-determine the average emissivity of the surface at 5800 k b)-determine the average emissivity of the surface at 300k c)-if kirchoff's law applies, what is the absorptivity of this surface when irradiated with sunlight? d)- would this make a better solar reflector or solar absorber?
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