physics the speed at which energy is propagated in a wave. This is the quantity determined when one measures the distance which the radiation travels in a given time. In a medium in which the speed increases with wavelength the group speed is less than the phase speed, and vice versa
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- group of three,
- group of twenty finance ministers and central bank governors,
- group of twenty-four,
- group practice,
- group representation,
- group theory,
- group therapy,
- group velocity,
- group work,
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Examples from the Web for group speed
In a vacuum there is no dying out of the waves, so that the group-speed and the wave-speed are identical.