Postprint version. Published in The Physics Teacher, Volume 35, Issue 8, November 1, 1997, pages 486-488.
Copyright © 1997American Association of Physics Teachers. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Association of Physics Teachers. The following article appeared in The Physics Teacher and may be found at http://dx.doi.org/10.1119/1.2344776.
NOTE: At the time of publication, the author Matthew Moelter was not yet affiliated with Cal Poly.