Phase velocity is

A. the maximum transverse velocity of a point on a wave, when the particle is moving fastest in each period of oscillation.
B. the velocity of a point on the wave at a given phase.
C. always half the group velocity in a wave packet.
D. always greater than the particle's velocity when the particle is described in terms of de Broglie matter waves.
E. unrelated to the energy of the wave

B.
The phase velocity is the velocity of a point on the wave at constant phase (a crest, for instance). The phase velocity is to the wave packet as the velocity of the center of mass is to a particle.

Physics & Space Science

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