Day 135: Closed Pipe Waves & Porosity

AP Physics: Closed Pipe Waves

I started class by showing students a few examples of sound waves in open pipes to establish that standing sound waves follow the same rules we saw last week for a standing wave on a string fixed at both ends. Then, I had students use our speed of sound materials to find the pattern for sound waves in a closed pipe. To keep the follow-up discussion short, I went back to standing at the front of the room and asking students to share their general results. In one class, students spontaneously started answering my questions by pointing out a lab partner who’d said something interesting and asking them to share, which lead to some students who don’t always speak up in whole-class settings getting their voices heard, which was pretty cool.

standing wave (1).jpg

Earth Science: Porosity

Students designed their own experiments to compare the porosity of sand, gravel, and Play-Doh. Students needed a little more scaffolding on how to measure the amount of water absorbed, but they ended up with nice results overall. Tomorrow, we’ll spend some time connecting these results back to the structure of aquifers.


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