phase velocity in a sentence

Examples

1. The phase velocity drops smoothly while the group velocity drops somewhat precipitously towards a minimum.
2. The mirrors do not require matching the phase velocities of the input and output waves.
3. In dispersive media the phase velocity is not necessarily the same as the group velocity.
4. Since wave phase velocity is given by
5. The superluminal phase velocity does not violate special relativity, because phase propagation carries no energy.
6. In this case the phase velocity is
7. These special disturbances propagate through a material at a speed slower than called the phase velocity.
8. The phase velocity is given as:
9. Your response leaves me wondering, though, are photons always traveling at the phase velocity?
10. The phase velocity varies with frequency.