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  2. Wave speed - Wikipedia

    en.wikipedia.org/wiki/Wave_speed

    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

  3. Speed of sound - Wikipedia

    en.wikipedia.org/wiki/Speed_of_sound

    The speed of a compression wave in a fluid is determined ... at its own speed, called the phase velocity, ... equal but opposite effects on the speed of sound, and ...

  4. Signal velocity - Wikipedia

    en.wikipedia.org/wiki/Signal_velocity

    Signal velocity is usually equal to group velocity (the speed of a short "pulse" or of a wave-packet's middle or "envelope"). However, in a few special cases (e.g., media designed to amplify the front-most parts of a pulse and then attenuate the back section of the pulse), group velocity can exceed the speed of light in vacuum, while the signal ...

  5. Phase velocity - Wikipedia

    en.wikipedia.org/wiki/Phase_velocity

    Propagation of a wave packet demonstrating a phase velocity greater than the group velocity. This shows a wave with the group velocity and phase velocity going in different directions. The group velocity is positive, while the phase velocity is negative. [1] The phase velocity of a wave is the rate at which the wave propagates in any medium.

  6. Group velocity - Wikipedia

    en.wikipedia.org/wiki/Group_velocity

    If ω is directly proportional to k, then the group velocity is exactly equal to the phase velocity. A wave of any shape will travel undistorted at this velocity. If ω is a linear function of k, but not directly proportional (ω = ak + b, b ≠ 0), then the group velocity and phase velocity are different.

  7. Wave - Wikipedia

    en.wikipedia.org/wiki/Wave

    Wave velocity is a general concept, ... the electric and magnetic fields satisfy the wave equation both with speed equal to that of the speed of light.

  8. Wavenumber - Wikipedia

    en.wikipedia.org/wiki/Wavenumber

    In the physical sciences, the wavenumber (or wave number), also known as repetency, [1] is the spatial frequency of a wave. Ordinary wavenumber is defined as the number of wave cycles divided by length; it is a physical quantity with dimension of reciprocal length , expressed in SI units of cycles per metre or reciprocal metre (m −1 ).

  9. Speed of gravity - Wikipedia

    en.wikipedia.org/wiki/Speed_of_gravity

    The speed of gravitational waves in the general theory of relativity is equal to the speed of light in vacuum, c. [3] Within the theory of special relativity, the constant c is not only about light; instead it is the highest possible speed for any interaction in nature.