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From: space@mit-mc
Newsgroups: net.space
Subject: Re:  Re: Light Sails
Message-ID: <861@mordor.UUCP>
Date: Sat, 2-Mar-85 18:41:17 EST
Article-I.D.: mordor.861
Posted: Sat Mar  2 18:41:17 1985
Date-Received: Mon, 4-Mar-85 20:36:27 EST
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From: Rick McGeer (on an z29-e) 

	I've said so many contradictory things about this issue that most of
them must be wrong.  As a result, I leave this to someone who knows more
about physics than I do.  However, Tipler, pp 958-960 seems to claim that
the increased kinetic energy of a particle struck by a photon is due to the
Compton effect, which I gave in my last note.  I can't figure out what's
wrong with the momentum calculations right at present, though...

						Rick.