Dictionary:WKBJ solutions

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A method attributed to Wentzel, Kramers, Brillouin, and Jeffreys for finding approximate solutions to the equation

,


where is large and positive and s2 is a monotonically increasing function of x. The WKBJ approximation is a high-frequency approximation that assumes that the properties of the medium are constant over several wavelengths. See Aki and Richards (1980, 416-418).