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group speed
noun
- 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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Example Sentences
In a vacuum there is no dying out of the waves, so that the group-speed and the wave-speed are identical.
From Project Gutenberg
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