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  3. problem3 the emissivity of a tungsten filament can be approxi...

Question: problem3 the emissivity of a tungsten filament can be approxi...

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Problem3 The emissivity of a tungsten filament can be approxi mated to be 0.5 for radiation at wavelengths less than I um and 0.15 for radiation at greater than 1 um. Determine the average emissivity of the filament at (a) 1500 K and (b) 2500 K. Also. determine the absorptivity and reflectivity of the filament at both temperatures.

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