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An angular velocity [omega] = 2 [pi] / 2 [pi] = T · F, units of rad / s, where T is the period, f is the frequency.
Wave vector (wave vector) is the wave number (wave number) short vectors. I.e., the magnitude of the wave vector wavenumber k = 2π / λ, units of rad / m, where [lambda] is the wavelength.
I.e., the direction of wave vector direction of wave propagation.
Thus ω / k = c, where c is the wave velocity. Constant velocity, the angular velocity is proportional to the magnitude of the wave vector.
Guxing Bo back to the equation: revealed that the number reflected wave is the spatial frequency of the wave, the angular velocity reflects the time-frequency waves. Know both, you know velocity.