An electron is trapped in a finite well. How “far” (in eV) is it from being free (that is, no longer trapped inside the well) if the penetration length of its wave function into the classically forbidden region is 1nm? The answer should be 0.038eV

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An electron is trapped in a finite well. How “far” (in eV) is it from being free (that is, no longer trapped inside the 
well) if the penetration length of its wave function into the classically forbidden region is 1nm?

The answer should be 0.038eV

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