Engineering, 16.04.2020 21:57, daemonacoster

The emissivity of a surface coated with aluminum oxide can be approximated to be 0.15 for radiation at wave- lengths less than 5 mm and 0.9 for radiation at wavelengths greater than 5 mm. Determine the average emissivity of this surface at (a) 5800 K and (b) 300 K. What can you say about the absorptivity of this surface for radiation coming from sources at 5800 K and 300 K

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The emissivity of a surface coated with aluminum oxide can be approximated to be 0.15 for radiation...