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Results tagged with phase-velocity
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user 35944
9
votes
Derviation of group velocity
Consider a wave
$$A = \int_{-\infty}^{\infty} a(k) e^{i(kx-\omega t)} \ dk,$$
where $a(k)$ is the amplitude of the kth wavenumber, and $\omega=\omega(k)$ is the frequency, related to $k$ via a dispers …
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