beero1000
Veteran Member
That's just not true. Standard loads for full professors at major research universities are usually one or two classes per semester, with possible reduction due to administrative responsibilities. If they're lucky 1 or 2 of those classes per year might be graduate level. Statistically, about a third of an average full professor's 60 hour work week is spend on teaching, grading, or preparing for classes.
On the other hand, the best researchers often don't make the best teachers, so if you want to learn physics at an undergraduate level, a top tier research university may not be the best choice.
Top researchers are not often found teaching undergrad classes. Even when their names are attached to the class, the teaching is often performed by grad students, which is sometimes a better deal.
By your own estimation of a tenured full professor teaching one or two classes each semester, and one or two per year--or up to half of those being grad classes, an undergrad is not very likely to be taught by a tenured full professor, much less a world class researcher, who often have reduced teaching loads and concentrate on their own work, funded by grants they bring to the university.
Tenured full professors spend more than 30% of their time preparing, lecturing, and administrating the classes they teach. That is fact, and counts their time spent, which already accounts for course reductions and graduate teaching assistants. Even if half of those courses are graduate courses (they're not), that is still a significant amount of time teaching undergraduates, which means you are incorrect. Hell, I know for a fact that at least one Fields Medalist taught Calc 1 this semester.
The fact that most classes are not taught by tenured professors is due to the fact that there are not enough tenured professors to do all the requisite teaching, not because top researchers are avoiding undergrads.