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The definition of since its first use in 1914 has been generalized to apply to coils and condensers, resonant circuits, resonant devices, resonant transmission lines, cavity resonators,. It has expanded beyond the electronics field to apply to dynamical systems in general: mechanical and acoustic resonators, material and quantum systems such as spectral lines and particle resonances, and optical resonators such as laser cavities. There are two common definitions for , which apply generally to all these

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