the ratio of the magnitude of the phase velocity vector of a sinusoidal wave in a given direction to the frequency of the wave
NOTE 1 – The wavelength has its minimum value in the direction of propagation; if no direction is specified. the wavelength is that in the direction of propagation.
NOTE 2 – The wavelength in any direction is 2π divided by the absolute value of the component, in this direction, of the real part of the wave vector.
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