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Most acoustic vibrations of air more or less confined to a given geometry can be explained by two basic models. One is the one-dimensional treatment of the air in a tube, and the other is the lumped-parameter treatment of the air within a volume that has a small hole in its side. The former is called a quarter-wave or half-wave tube, depending on the nature ...


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The frequency of the sound you're hearing is related to the changing resonant frequency of your bottle based on the frequency/velocity relationship of sound waves v=f*λ Velocity (v) is the speed of sound in air which is nearly constant, typically 343 m/s. The length of the air column in your bottle is the wavelength (λ) of the resonant frequency. So as the ...


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