group velocity

group velocity

noun Physics.
the velocity of finite numbers of waves undergoing simple harmonic motion, equal to the phase velocity when it does not vary with the wavelengths of the waves. The group velocity of the set of waves produced in water when a stone is dropped is less than the velocity of the individual waves.

Origin:
1885–90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Group velocity is always a great word to know.
So is base unit. Does it mean:
one of the units, as mass, length, time, or electric current, taken as a basis for a system of units in the sciences
the elasticlike force existing in the surface of a liquid caused by asymmetries in the intermolecular forces between surface molecules
Collins
World English Dictionary
group speed or group velocity
 
n
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
 
group velocity or group velocity
 
n

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