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Group velocity : ウィキペディア英語版
Group velocity

The group velocity of a wave is the velocity with which the overall shape of the waves' amplitudes—known as the ''modulation'' or ''envelope'' of the wave—propagates through space.
For example, if a stone is thrown into the middle of a very still pond, a circular pattern of waves with a quiescent center appears in the water. The expanding ring of waves is the wave group, within which one can discern individual wavelets of differing wavelengths traveling at different speeds. The longer waves travel faster than the group as a whole, but their amplitudes diminish as they approach the leading edge. The shorter waves travel more slowly, and their amplitudes diminish as they emerge from the trailing boundary of the group.
== Definition and interpretation ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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