Group Velocity

v_{g} = \frac{d ω}{d k}

Velocity at which the envelope of a wave packet propagates; represents energy transfer speed.

Variables

v_g

Group velocity

Speed of wave packet/energy

m/s

Angular frequency

Radians per second

rad/s

Wave number

Radians per meter

rad/m

For dispersive media, v_g = dω/dk. For non-dispersive media, v_g = v_p.

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