Solve the all parts of following problem:
Problem: The energy of an electron in a 2.00-eV-deep potential well is 1.50 eV.
Part I: At what distance into the classically forbidden region has the amplitude of the wave function decreased to 25.0% of its value at the edge of the potential well?
I want help to find at what distance into the classically forbidden region the amplitude of the wave function decreased to 25.0% has and express your answer with the appropriate units.