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  2. Phase velocity - Wikipedia

    en.wikipedia.org/wiki/Phase_velocity

    The phase velocity of a wave is the rate at which the wave propagates in any medium. This is the velocity at which the phase of any one frequency component of the wave travels. For such a component, any given phase of the wave (for example, the crest) will appear to travel at the phase velocity. The phase velocity is given in terms of the ...

  3. Group delay and phase delay - Wikipedia

    en.wikipedia.org/wiki/Group_delay_and_phase_delay

    The group delay and phase delay properties of a linear time-invariant (LTI) system are functions of frequency, giving the time from when a frequency component of a time varying physical quantity—for example a voltage signal—appears at the LTI system input, to the time when a copy of that same frequency component—perhaps of a different physical phenomenon—appears at the LTI system output.

  4. Van Deemter equation - Wikipedia

    en.wikipedia.org/wiki/Van_Deemter_equation

    In liquid chromatography, the mobile phase velocity is taken as the exit velocity, that is, the ratio of the flow rate in ml/second to the cross-sectional area of the ‘column-exit flow path.’ For a packed column, the cross-sectional area of the column exit flow path is usually taken as 0.6 times the cross-sectional area of the column.

  5. Electrical length - Wikipedia

    en.wikipedia.org/wiki/Electrical_length

    The phase velocity at which electrical signals travel along a transmission line or other cable depends on the construction of the line. Therefore, the wavelength corresponding to a given frequency varies in different types of lines, thus at a given frequency different conductors of the same physical length can have different electrical lengths.

  6. Dispersion (water waves) - Wikipedia

    en.wikipedia.org/wiki/Dispersion_(water_waves)

    Dispersion of gravity waves on a fluid surface. Phase and group velocity divided by shallow-water phase velocity √ gh as a function of relative depth h / λ. Blue lines (A): phase velocity; Red lines (B): group velocity; Black dashed line (C): phase and group velocity √ gh valid in shallow water.

  7. Group velocity - Wikipedia

    en.wikipedia.org/wiki/Group_velocity

    The group velocity is positive (i.e., the envelope of the wave moves rightward), while the phase velocity is negative (i.e., the peaks and troughs move leftward). The group velocity of a wave is the velocity with which the overall envelope shape of the wave's amplitudes —known as the modulation or envelope of the wave—propagates through space.

  8. Matter wave - Wikipedia

    en.wikipedia.org/wiki/Matter_wave

    The phase velocity in isotropic media is defined as: = Using the relativistic group velocity above: [2]: 215 = This shows that = as reported by R.W. Ditchburn in 1948 and J. L. Synge in 1952. Electromagnetic waves also obey v p ⋅ v g = c 2 {\displaystyle \mathbf {v_{p}} \cdot \mathbf {v_{g}} =c^{2}} , as both | v p | = c {\displaystyle ...

  9. Airy wave theory - Wikipedia

    en.wikipedia.org/wiki/Airy_wave_theory

    Phase and group velocity divided by √ gh as a function of ⁠ h / λ ⁠. A: phase velocity, B: group velocity, C: phase and group velocity √ gh valid in shallow water. Drawn lines: based on dispersion relation valid in arbitrary depth. Dashed lines: based on dispersion relation valid in deep water.