IEVref: | 702-02-22 | ID: | |

Language: | en | Status: Standard | |

Term: | group velocity | ||

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Symbol: | $\left|{\overrightarrow{v}}_{\text{g}}\right|$ | ||

Definition: | the velocity vector at a point, in a propagation medium, of a signal which may be ideally represented by two superimposed sinusoidal waves of equal amplitude and slightly different frequencies approaching a common limiting value
NOTE – In the most general case the reciprocal of the magnitude $\left|{\overrightarrow{v}}_{\text{g}}\right|$ of the group velocity vector is equal to the derivative of the reciprocal of the wavelength
$\frac{1}{\left|{\overrightarrow{v}}_{\text{g}}\right|}=\frac{\text{d}\left({\lambda}^{-1}\right)}{\text{d}f}$ | ||

Publication date: | 1992-03 | ||

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Internal notes: | 2017-06-02: Cleanup - Remove Attached Image 702-02-22-symb.gif 2017-06-02: Cleanup - Remove Attached Image 702-02-221.gif | ||

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$\frac{1}{\left|{\overrightarrow{v}}_{\text{g}}\right|}=\frac{\text{d}\left({\lambda}^{-1}\right)}{\text{d}f}$