最終更新日：2025/11/21
In dispersive media, the phase velocity can exceed the speed of light without violating causality because it describes the propagation of constant-phase points for a pure sine wave of infinite extent and infinitesimal amplitude.
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In dispersive media, the phase velocity can exceed the speed of light without violating causality because it describes the propagation of constant-phase points for a pure sine wave of infinite extent and infinitesimal amplitude.
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