kirag8261 kirag8261

18-11-2022
Mathematics

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The emissivity of a surface coated with aluminum oxide can be approximated to be 0. 15 for radiation at wavelengths less than 5 μm and 0. 9 for radiation at wavelengths greater than 5 μm. Determine the average absorptivity of this surface at 1040. 00 K

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