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From: lambert@boring.uucp (Lambert Meertens)
Newsgroups: net.physics
Subject: Re: Electron Counting...
Message-ID: <6747@boring.UUCP>
Date: Thu, 30-Jan-86 04:31:26 EST
Article-I.D.: boring.6747
Posted: Thu Jan 30 04:31:26 1986
Date-Received: Sat, 1-Feb-86 07:19:51 EST
References: <748@decwrl.DEC.COM>
Reply-To: lambert@boring.UUCP (Lambert Meertens)
Organization: CWI, Amsterdam
Lines: 15
Apparently-To: rnews@mcvax

>	Find the volume of the sphere (in cc) [is it 4/3 pi r^3?]
>	    (104.7197cc?).
>	[...]
>	So (if I got the folmula for volume of a sphere correct) the number
>	of electrons in an uncharged 10cm sphere of copper is:
>			2.57045e26

The formula is correct, but the value computed is not: 104.7197 = 4/3 pi r^2.
The final value given should therefore be multiplied by 5, which gives us
about the 1.3 * 10^27 electrons reported by gwyn@brl-tgr.UUCP.
-- 

     Lambert Meertens
     ...!{seismo,okstate,garfield,decvax,philabs}!lambert@mcvax.UUCP
     CWI (Centre for Mathematics and Computer Science), Amsterdam