The speed of propagation of a sine wave or a sinusoidal component of a complex wave, equal to the product of its wavelength and frequency.
- The speed of each frequency component is called phase velocity, while the packet's speed is called group velocity.
- Notice the light wave is still only propagating at c, the phase velocity of the wave, however, may travel less, or even greater than at the speed of light.
- For example, the phase velocity of a wave packet is a pseudo process but the group velocity is a causal process; yet both licence reliable predictions.
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