What happens when wave pulses go from one medium to another? What happens at the boundary? It took many trials, and this video, to get everyone in class on the same page.
We also talked about what happened when two waves of very similar frequencies occur at the same point in space. Thanks again, Desmos:
We also talked about what happens to the frequency of a wave when the source of the wave is moving relative to the observer.
Last, we started talking about what happens to a wave that is confined to a fixed space. It seemed that, with the bounce at the end, you could get constant constructive interference. Cool!