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This is one of the best teachers I have ever had at UCLA. I completely didn't understand physics before I went to his class, and then all of the sudden, I was getting A's on the midterms. They were almost identical to the practice midterms, which helped I'm sure. Going to his office hours helped, of course, as well. He's very friendly, and cares a lot about his students. My favorite thing about his class was that he used "concept tests," which are multiple choice questions that help him know how much the class is understanding the information. If few people get the answer right, he'll go over the concept again. The concept tests are also helpful because they keep you awake in a class that teaches some of the most boring things I've ever learned. He also makes it more exciting by doing lots of demonstrations.
He was really funny in lecture and I think he is very kind. However, he does have a little bit of an attitude at office hours. Sometimes when someone would ask him to go over something, he'd get a little irrate and impatient, but for the most part he was cool. He definitely placed a certain emphasis on the homework and had all sorts of weekly quizzes that were a little annoying to keep track of. His lectures were okay, though sometimes I felt that the lectures were a little confusing, but I think that had to do with the difficulty of the material that we were learning. Waves and oscillatory motion were easy to understand; electric fields and electric potential were really confusing for me; magnetism was okay to understand, but Faraday's Law was really confusing. I think he really rushed through the material covered after the second midterm and EVERYONE I knew was really confused about Faraday's Law going into the final. But for all the worrying, the end result was good; I got an A- in the class.
Actually, one of the great perks about being in his class and going to his office hours is that he will bump up your grade if you are on the borderline and if he thinks that you have studied hard. I think that may have happened to me.
I really liked Wallny and his teaching style. His lectures were very well presented, although sometimes he rushed them a bit to finish covering the topic. He has in-class concept questions to make sure students understood the material, and although he assigned quite a bit of homework and has reading quizzes, these were actually really helpful (staying on top of the reading and not falling behind in lecture). He is also very concerned about student learning and is really helpful if you a question. I would really recommend taking him, and also signing up for his Honors class. It's not that much additional work (especially because he goes over the homework before it's due), it's really enjoyable, and it helps you understand the material from class better.
Honestly, I really didn't like him. Personally he's funny and he makes lecture enjoyable. But I really didn't find him that helpful. He focuses more on concepts which he claims helps to understand the actual problems - but that's not true. I wish he did more work with how to do problems. The material is really difficulte. The average on both midterms was below 50%. The practice midterms/final really don't give you a heads up on how the tests are going to be. On the midterms time was a big constraint, but on the final its not.
Honestly speaking, Wallny is by far my FAVORITE professor at UCLA. He is a very caring person. You always feel welcome to seek help from him. A really good fact is that if you improve on your midterms and final, he will bump your grades up because you show dedication! ADVICE. Go to his office hours! You might find it pointless, but he remembers students who go to his office hours, which will benefit you greatly when he does the final grade! TA is pretty awesome as well. It's a different perspective on explaining things.
Do NOT get fooled by the comments of the previous student, Pr. Wallny is HARD!!! (I don't know what those people are thinking) The average for his 1st midterm was a 23 out of 53, and his second one was around the same...The curve is low, so if you believe curves usually help you out, then great you can get a B with a 28. Don't get me wrong, he is a GREAT guy but just a hard test giver. However, his final was not as bad as his midterms, it was actually pretty fair. As I said he is a funny, nice person, but not a great professor. I never really understood his explanations, the TA's saved me!! a big shout out for the two Rouzbeh's, awesome TAs, just great...!! so go to their office hours ;) ...and yes, do the honors seminar as well, we only had a meeting per week and went over the assigned one HW problem, it's really chill and at the end we had a 2page research paper...Other than that, 6B is a hard class, get prepared to study a lot. I guess Wallny is an ok professor, if his final was hard i would have had rated him really badly..but i give him a B+.