Cavity ResonanceAn air cavity will exhibit a single resonant frequency. If extra air is pushed into the volume and then released, the pressure will drive it out. But, acting somewhat like a mass on a spring which is pulled down and then released, it will overshoot and produce a slight vacuum in the cavity. The air will oscillate into and out of the container for a few cycles at a natural frequency. The qualitative nature of the frequency determining factors: ![]()
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Cavity OscillationsThe single frequency cavity resonance suggests a parallel with the single resonant frequency of a mass on a spring. In fact, the term "acoustic mass" is sometimes used in connection with such oscillations.
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Applications of Cavity Resonance
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Cavity Resonant FrequencyA quantitative analysis of the cavity resonance gives the frequency expression ![]() ![]() Frequency, area, volume or length may be calculated by clicking on the desired quantity in the above highlighted formula. Data values not entered will default to the experimental values for a plastic coke bottle used in an example. All parameters may be changed.
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