The emissivity of a tungsten filament can be approximated to be 0.5 for radiation at wavelengths less than 1 mm and 0.15 for radiation at greater than 1 µm. Determine the average emissivity of the filament at (a) 2000 K and (b) 3000 K. Also, determine the absorptivity and reflectivity of the filament at both temperatures.
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