If the answer is not in the list, please state that and please show the formula you used and your answer.

Both these questions are for He, but I don't think the element is an issue, correct?

For a He atom (atomic mass = 4.0) confined in a 1D box of length 5nm, calculate the energy for n=1. A. 1.21019 B. 2.61020 C. 3.31023 D. 3.31026 E. 8.31017 For a He atom (atomic mass = 4.0) confined in a 1D box of length 5nm, calculate the energy for n=2. A. 4.81019 B. 1.041019 C. 1.321022 D. 1.321025 E. 6.61023