Abstract
Look at the two bottles in Fig. 1. Suppose you picked up each one in turn and tapped its bottom while listening to the sound generated by holding the opening close to your ear. Without peeking at the answer at the end, which one do you expect to emit sound at a higher pitch? These bottles are Helmholtz resonators, and they were part of an experimental 11th-grade project of S.B. and T.D at our high school on which we wish to report.
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