Juniors Diego Ramos and Helen McSorley set up for a resonance lab in AP Physics. “We’re using principles of waves and resonance to determine what the speed of sound is,” physics teacher Cinsy Krehbiel said. “This is an example of how you can take data and determine a physical characteristic of something. When we use graphs to [show how the perceived resonance of the standing wave tells us the fundamental frequency], we find that we get a real[ly] clean relationship among the data.” Students were also required to hypothesize the results of the lab if the air in the pipe were replaced with carbon dioxide.