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An electron is moving past the square well shown in Fig. . The electron has energy E = 3U0_. What is the ratio of the de Broglie wavelength of the electron in the region x 7 L to the wavelength for 0 6 x 6 L?

The potential energy U is zero within the
potential well (in the interval 0 . x . L) and
has the constant value U, outside this interval.
U(x)
U.

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