Recommended Citation
Postprint version. Published in American Journal of Physics, Volume 61, Issue 9, September 1, 1993, pages 862-863.
The definitive version is available at https://doi.org/10.1119/1.17427.
Disciplines
Physics
Copyright
Publisher statement
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 American Journal of Physics.
URL: https://digitalcommons.calpoly.edu/phy_fac/58