The electron is in a one-dimensional rectangular potential well with infinitely high walls. Find the width of the pit, if the energy difference between the levels with quantum numbers n1 = 2 and n2 = 3 is 0.3 eV.

Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
If you have any questions about the decision to write. I try to help.