The numbering sequence at Old Dominon University places undergraduate courses at the 100, 200, 300, and 400 levels. Courses that may have graduate, as well as undergraduate students enrolled, are listed in a dual mode, e.g., 456/556. Graduate students may enroll in the 500, 600, 700 and 800 levels. Master's and doctoral courses are dual-listed at 700/800 levels. Courses marked with + may not be counted for credit in physics graduate programs.