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What (who) is group velocity - definition

PHYSICAL QUANTITY

Group Velocity; Group speed; Wave group; Group velocities

group velocity

¦ noun Physics the speed at which the energy of a wave travels.

Group velocity dispersion

DEPENDENCE OF GROUP VELOCITY ON FREQUENCY

Group delay dispersion; Group velocity dispersion

In optics, group velocity dispersion (GVD) is a characteristic of a dispersive medium, used most often to determine how the medium will affect the duration of an optical pulse traveling through it. Formally, GVD is defined as the derivative of the inverse of group velocity of light in a material with respect to angular frequency,

https://en.wikipedia.org/wiki/Group_velocity_dispersion

Detonation velocity

CHARACTERISTIC OF EXPLOSIONS

Velocity of detonation; Detonation speed; Explosive velocity

Explosive velocity, also known as detonation velocity or velocity of detonation (VoD), is the velocity at which the shock wave front travels through a detonated explosive. Explosive velocities are always faster than the local speed of sound in the material.

https://en.wikipedia.org/wiki/Detonation_velocity

Wikipedia

Group velocity

The group velocity of a wave is the velocity with which the overall envelope shape of the wave's amplitudes—known as the modulation or envelope of the wave—propagates through space.

For example, if a stone is thrown into the middle of a very still pond, a circular pattern of waves with a quiescent center appears in the water, also known as a capillary wave. The expanding ring of waves is the wave group, within which one can discern individual waves that travel faster than the group as a whole. The amplitudes of the individual waves grow as they emerge from the trailing edge of the group and diminish as they approach the leading edge of the group.

https://en.wikipedia.org/wiki/Group velocity