Wave speed

Wave speed is a wave property which may mean only one of several things:

which may refer to absolute value of:

• phase velocity, the velocity at which a wave phase propagates at a certain frequency.
• group velocity, the propagation velocity for the envelope of wave groups and often of wave energy. This is different from the phase velocity for dispersive waves.
• signal velocity, or information velocity, which is the velocity at which a wave carries information.
• front velocity, the velocity at which the first rise of a pulse above zero moves forward.