Definitely seemed to improve a lot according to what I've heard from previous students. Class was very organized and lectures were clear. Homework took a while but was not unfair in any way. Easily accessible outside of class, helpful office hours and responds to emails very fast.

Good lectures and also great typed-out lecture notes if you miss lecture. Both midterm and final were similar to practice exams. Homework is difficult but helpful and interesting. The class is fast paced but 115C seems to be like that with any prof.

First A- in my quantum mechanics class. This guy just dont give A

Prof Jin's course is of standard difficulty, or at least in terms of one of the most difficult and fast-pace courses here. His lecture notes are always fantastic and help you learn quantum. He might give difficult finals but he'll do curves. Sometimes his wording (in HW, lecture) is confusing, but you'll find it inspiring after getting his meaning.

Terrible professor. Told a whole class of physics majors that they arent trying hard enough rather than stopping to question the quality of his own teaching

Worst physics professor at UCSB by FAR!!! Super condescending and passive aggressive. News flash Mr. Chenhao if everyone does bad on your exam maybe you need to do a better job teaching instead of blaming your students. The exams are calculation heavy and don't give any physics insight; too many problems for midterm. The lecture are below subpar.