High Quality Content by WIKIPEDIA articles! In physics, the WKB approximation is the most familiar example of a semiclassical calculation (See Old quantum theory) in quantum mechanics in which the wavefunction is recast as an exponential function, semiclassically expanded, and then either the amplitude or the phase is taken to be slowly changing. The name of this method is an acronym for Wentzel–Kramers–Brillouin approximation. Other often-used acronyms for the method include JWKB approximation and WKBJ approximation, where the "J" stands for Jeffreys.

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