Wave speed is a wave property, 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, 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

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