group speed

group velocity

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

Nearby words

  1. group of three,
  2. group of twenty finance ministers and central bank governors,
  3. group of twenty-four,
  4. group practice,
  5. group representation,
  6. group theory,
  7. group therapy,
  8. group velocity,
  9. group work,
  10. grouper

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

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