What is the difference between Phase velocity and group velocity
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Briefly, phase velocity refers to the velocity of a monochromatic wave, let's say, the velocity of one of the peaks of the wave. ... On the other hand, group velocity refers to a group composed of waves within a frequency band ∆ω. Group velocity is the velocity with which the entire group of waves would travel.
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As you can see, it is different from the phase velocity of the wave. Phase velocity of a wave is the velocity with which its phase travels in space, while group velocity is the velocity with which its amplitude(envelope) travels in space.
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