# Dictionary:WKBJ solutions

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{{#category_index:W|WKBJ solutions}}
A method attributed to **W**entzel, **K**ramers, **B**rillouin, and **J**effreys for finding approximate solutions to the equation

where is large and positive and *s*^{2} 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).