So, what happens when a wave hits a boundary? We went to lab and saw that pretty quickly.
What happens when two waves overlap? That was more difficult. We went to lab, but we couldn't really see it that well. We had to go to simulations to understand what was going on.
I made an answer key for one of the practice sheets I found in the Modeling materials. I won't post the answer key, for obvious reasons, but I've never made an animated answer key before:
Desmos can be so cool sometimes.