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Path: utzoo!linus!philabs!pwa-b!utah-gr!thomas
From: thomas@utah-gr.UUCP (Spencer W. Thomas)
Newsgroups: net.cooks,net.flame
Subject: Re: Truth in Advertising?
Message-ID: <1245@utah-gr.UUCP>
Date: Fri, 16-Nov-84 11:40:06 EST
Article-I.D.: utah-gr.1245
Posted: Fri Nov 16 11:40:06 1984
Date-Received: Sun, 18-Nov-84 20:41:18 EST
References: <2559@dartvax.UUCP> <642@watdcsu.UUCP>
Reply-To: thomas@utah-gr.UUCP (Spencer W. Thomas)
Organization: Univ of Utah CS Dept
Lines: 21
Summary: 


In article <642@watdcsu.UUCP> haapanen@watdcsu.UUCP (Tom Haapanen [DCS]) writes:
>Obviously, black absorbs the most heat, as it does not *reflect* light
>rays of any wavelength.  On the other hand, a silver car will reflect
>most light rays (waves?  particles?).
>
>On the other hand, an object of colour x can only radiate light (read:
>heat) of colour x (i.e. that wavelength).  Therefore, a 100% black pot
>will radiate *no heat* at all.  It will be warm to the touch, though.
>However, it is impossible to make a 100% black pot (if it was 100%
>black, it would absorb all the light and you wouldn't be able to see
>it!), but an almost-black pot is still the best way to go.

I can't believe that I'm reading this on the netnews!  As any first year
physics student knows, an absolutely black object radiates the MOST heat
of all objects at the same temperature.  The absorption/radiation curves
are, and must be, the same (an object will not radiate at a wavelength
which it does not absorb).

Back to school for you.

=Spencer