 Slowness (source code)

= Slowness
{title2=$s=1/v$}

<Slowness> is the reciprocal of <phase velocity>, measured in time per distance. A <plane wave> with <wavevector> $\mathbf k$ and <angular frequency> $\omega$ has vector <slowness> $\mathbf p=\mathbf k/\omega$. Its direction is the <wavefront> normal, which need not be the <group velocity> direction in an <anisotropic> medium.

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