<p>Ay (APh) has more requirements than physics, so it would be even more difficult. Essentially not doable unless one is a very exceptional student (at Caltech standards), and I’m not really sure why people would want to do that combination. Double majoring (at Caltech at least) is one of those ideas that sound really good before coming to Caltech, but students usually realize that there’s plenty to be learned in just one subject area.</p>