Attached are the slide for Tuesday. Frank Wolfs _____________________________________________________________________ Frank L. H. Wolfs e-mail: wolfs@pas.rochester.edu Department of Physics and Astronomy University of Rochester B&L 203A, RC Box 270171 fax: (585) 275 - 8527 284 Hutchison Rd. phone: (585) 210 - 3271 Rochester, NY 14627 http://teacher.pas.rochester.edu/