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Article #967Re: Non-Relflecting object
From: Paul Ciszek
Date: Tue, 15 Dec 1992 01:55
Date: Tue, 15 Dec 1992 01:55
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dwarner@milo.ub.com (Dave Warner) writes: >Okay, so suppose the existance of an object that does not emit or reflect >anything in the visual spectrum. The object is not transparent or >translucent. Let the object assume the mass and dimensions of a 4 x 8 sheet >of marine plywood. >What does it look like? If it is non-reflecting, it cannot also be non-emitting UNLESS it is cooled to absolute zero. In that case, you wouldn't see it for the layers of frozen oxygen, nitrogen, carbon dioxide, and water that would quickly form on it. If it is a perfect absorber, then at any temperature above absolute zero it will radiate some light. But if it is at room temperature (or not too much warmer than that) this radiation will be invisible to the human eye, and it would look like a sheet of plywood painted matte black.
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Newsgroups: alt.folklore.science Path: arc1-ca.pugleaf.net!sparky!uunet!mnemosyne.cs.du.edu!nyx!pciszek From: pciszek@nyx.cs.du.edu (Paul Ciszek) Subject: Re: Non-Relflecting object Message-ID: <1992Dec15.015535.12931@mnemosyne.cs.du.edu> Sender: usenet@mnemosyne.cs.du.edu (netnews admin account) Organization: University of Denver, Dept. of Math & Comp. Sci. References: <dwarner.18@milo.ub.com> Date: Tue, 15 Dec 92 01:55:35 GMT Lines: 22