group speed


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group speed

or

group velocity

n
(General Physics) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Before they disbanded, boy group Speed released an anthemic, Halloween-inspired song perfectly suitable for the scariest day of the year.
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The group speed is then the same as the dipole's translational speed.
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It's hard to buy into the first theory, even though there's not a huge difference be tween the top sprint handicaps and Group speed races in Britain.