Wave dispersion
= Wave dispersion
= Dispersive
{synonym}
Wave dispersion means that <phase velocity> depends on <wavenumber> or, equivalently, <wavelength>. <Wave packets> generally travel with <group velocity>, which need not equal <phase velocity>. The <linear rotating shallow-water dispersion relation> $\omega^2=f^2+c^2k^2$ has faster long-wave phase motion but slower long-<wave packet> motion when $f\ne0$.