This question was good one from today. After introducing the raising and lowering operators, we had some “practice” reasoning about which matrix elements would be zero (and thus saving the work of cranking out each calculation).
QM Clicker Questions
Brian reflects on his physics teaching
This question was good one from today. After introducing the raising and lowering operators, we had some “practice” reasoning about which matrix elements would be zero (and thus saving the work of cranking out each calculation).
Teach. Brian. Teach. 
So thrilled to see “how many of these” format! I hope you’ll write about how the discussion went, how you drove it, how they responded.
Peter