Abstract
One goal of Project Listen Up is to enhance children’s understanding of acoustics through engagement in basic acoustics experiments. This work proposes an experiment that examines the resonant frequencies of an air column. Equipment for this experiment consists of a small tunable oscillator circuit connected to a loudspeaker, which can also be used for other experiments in the kit. The experimenter will provide a cardboard tube, rubber band, plastic wrap, and sand. Resonance is demonstrated by placing the loudspeaker at the base of the tube, covering the top of the tube with a plastic wrap membrane, and placing sand grains on top of the membrane. As frequency is adjusted, the sand grains are excited at the resonance frequencies of the tube. Frequencies at which sand motion is observed can be compared to a simple algebraic model, which relates the length of the tube to the resonance frequencies of the system. An optional advanced experimental track investigates the effect of varying the length of the tube....
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