group speed

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

Example Sentences

I received notification that I could take a group speed awareness course or receive a fine and three points on my licence, which was clean at the time.

From BBC

“It’s a versatile group — speed, power and quickness. “And we’re pretty big too.”

From Seattle Times

Faulconer agreed then to have the advisory group speed up its work.

From Washington Times

It was impossible to determine the size of each image of the group, speed, or altitude.

From Project Gutenberg