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what is the difference between group velocity and phase velocity?

what is the difference between group velocity and phase velocity?

Science   Advanced-Physics   
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Answer #1
PHASE VELOCITY GROUP VELOCITY
phase velocity is the rate at which the phase of the wave propagates in space group velocity is the rate at which the overall wave amplitude shape propagates in space
The phase velocity will generally be greater than group velocity in a normal medium The group velocity will be greater than phase velocity in an anomalous medium
the carrier wave will travel with phase velocity in a wave packet the envelope in wave packet will travel with group velocity .
phase velocity has high frequency group velocity has low frequency
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