These are the lectures in physics that I gave last year and the year before to the freshman and sophomore classes at Caltech. The lectures are, of course, not
verbatim — they have been edited, sometimes extensively and sometimes less so.
lhe lectures form only part of the complete course. The whole group of 180
students gathered in a big lecture room twice a week to hear these lectures and
then they broke up into small groups of 15 to 20 students in recitation sections
under the guidance of a teaching assistant. In addition, there was a laboratory
session once a week.