1. Quantum II (PHYS 4410) Lecture 13 Fine structure of hydrogen electron levels HWK 4 is due today at 6PM.

2. Physics Colloquium 4PM today, Duane G1B20 Prof. Zoltán Fodor, Eötvös Loránd University The Origin of the Mass of the Visible Universe

3. Undergraduate Research Survey Who’s eligible? EVERYONE With or without research experience Freshmen to seniors 5-10 minutes of your time Enter into a drawing for one of ten $10 gift cards See email from Kristen Apodaca about the Undergraduate Research Survey for survey link 0r (http://bit.ly/1twTvBC) THANK YOU from S. 5 Hanshaw, CU Senior Prof. Heather Lewandowski

5. 150 A)Ummm… I thought it was Ze 2. B)Isn’t it 4/3 ? C)Where is the minus sign? D)I’m looking for the inverse length. Somebody says: Hey! You know, ““… Then you say…

6. 150 A)Ummm… where’s the 2? B)Shouldn’t there be a  2 ? C)I’m looking for the inverse length squared D)What about n ? Somebody says: Hey! You know, ““… Then you say…