Recommended Citation
Postprint version. Published in American Journal of Physics, Volume 58, Issue 6, June 1, 1990, pages 602-603.
The definitive version is available at https://doi.org/10.1119/1.16414.
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/57