An enclosure has an inside area of 100 m2, and itsinside

Chapter 12, Problem 12.24

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An enclosure has an inside area of 100 m2, and itsinside surface is black and is maintained at a constanttemperature. A small opening in the enclosure has anarea of 0.02 m2. The radiant power emitted from thisopening is 70 W. What is the temperature of the inte-rior enclosure wall? If the interior surface is main-tained at this temperature, but is now polished, whatwill be the value of the radiant power emitted from theopening?

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