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An electron is bound in a finite square well of width 1.85 nm and finite depth...

An electron is bound in a finite square well of width 1.85 nm and finite depth U0=6E?, where E? is the ground-state energy for an infinitely deep potential well that has the same width.

If the electron is initially in the ground state level of the finite square well, E1=0.625E?, and absorbs a photon, what maximum wavelength can the photon have and still liberate the electron from the finite well?

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