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British Dictionary definitions for group speed

group speed

group velocity

noun
  1. 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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for group speed

Historical Examples

  • In a vacuum there is no dying out of the waves, so that the group-speed and the wave-speed are identical.

    Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 5

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