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The emissivity of an object coated with aluminum oxide can be approximated as 0.15 for radiation less than 5m and 0.9 for radiation above that

The emissivity of an object coated with aluminum oxide can be approximated as 0.15 for radiation less than 5m and 0.9 for radiation above that wavelength. Show at which temperature is this object more emissive, 5800K or 300K

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