CT13.15In other words, k1 must not be too small for the approximation to apply.The physical interpretation of this result can be seen as follows. The de Broglie wavelength isFig. 13.1 The accessible and inaccessible regions are denoted as Ac and In respectively. The point x = a1 is a turning point with the inaccessible region on the left and the accessible side on the right.CT13.16Hence the first condition in Equation (13.15) gives
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