Assertion: order dispersion | /r/HasProperty | 1)a change
Facets:
value: in the group velocity
type: OTHER
Source sentences:
text: First-order dispersion" is exactly what you are refering to, in which case dn/df is constant (over a region) and this causes 1)a change in the group velocity relative to the phase velocity; 2) a change in the phase of the wavepacket at its center.