Jisho

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Noun
1. phase velocity
Wikipedia definition
2. Phase velocityThe phase velocity of a wave is the rate at which the phase of the wave propagates in space. This is the velocity at which the phase of any one frequency component of the wave travels. For such a component, any given phase of the wave (for example, the crest) will appear to travel at the phase velocity.
Read “Phase velocity” on English Wikipedia
Read “位相速度” on Japanese Wikipedia
Read “Phase velocity” on DBpedia

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