In class, we learned the Schrodinger equation, and applied it to a particle in an
infinite well (ie, PIB model).

Imagine that this well had an infinitely high potential barrier on the left side,
but has a right-side potential barrier (Vr) of only 4 eV. Please estimate at what n
(what energy level) the electron must be to overcome the barrier and escape
entirely from the well (that is, find where E>Vr).