SELECT * FROM DAvidi WHERE `DAvid`="pavHJ0qTdFw"
SELECT * FROM DAvidKanal WHERE `Cid`="2090"
SELECT * FROM DAvid WHERE `DAvid`="pavHJ0qTdFw"
Group velocity Wave group.gif
auFuck https://upload.wikimedia.org/wikipedia/commons/b/bd/Wave_group.gif
by https://commons.wikimedia.org/wiki/User:Kraaiennest
The group velocity of a wave is the velocity with which the overall envelope shape of the wave's amplitudes—known as the modulation or envelope of the wave—propagates through space.
https://en.wikipedia.org/wiki/Group_velocity
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