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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