Group velocity facts for kids
Images for kids
Frequency dispersion in groups of gravity waves on the surface of deep water. The red dot moves with the phase velocity, and the green dots propagate with the group velocity. In this deep-water case, the phase velocity is twice the group velocity. The red dot overtakes two green dots when moving from the left to the right of the figure.New waves seem to emerge at the back of a wave group, grow in amplitude until they are at the center of the group, and vanish at the wave group front.For surface gravity waves, the water particle velocities are much smaller than the phase velocity, in most cases.
fr:Vitesse d'une onde#Vitesse de groupe
nl:Voortplantingssnelheid#Fase- en groepssnelheid
Group velocity Facts for Kids. Kiddle Encyclopedia.