Two 1-dimensional quantum wells having the same width L and made of the same material (same electron effective mass m*). One quantum well has infinitely high walls and another quantum well has finite wall height Vb. Calculate and plot the difference between first energy levels of the two wells (E1inf -E1finite) depending on the Vb. Do the same for the second energy levels E2inf –E2finite. Assume that m*= m0, L = 60 nm and Vb = 0.02eV, 0.2eV, 1eV, and 20eV, m0 =9.11x10-31kg.