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Introductory Physics Homework Help
Radiation - finding emissivity of a sphere
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[QUOTE="haruspex, post: 6466364, member: 334404"] The question setter seems to expect you to treat the surrounding air as a black body, so subtract the radiation the sphere absorbs from that. The fraction it absorbs will be governed by the same e value. But it's nonsense. It takes a pretty thick layer of air to radiate much at all, and it certainly is not a black body (fortunately). Even outdoors, most of the received radiation would be from other solid bodies, such as the ground. [/QUOTE]
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Radiation - finding emissivity of a sphere
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