- #1

hidemi

- 208

- 36

- Homework Statement
- I used the eq. below, but I can't find the answer.

- Relevant Equations
- Σ (nx^2+ ny^2) (h2/8mL^2)

Five electrons are in a two-dimensional square potential energy well with sides of length L. The potential energy is infinite at the sides and zero inside. The single-particle energies are given by (h^2/8mL^2) (nx^2+ ny^2) where nx and ny are integers. The energy of the first excited state of the system is

(A) 13 (h^2/8mL^2) (B) 22 (h^2/8mL^2) (C) 24 (h^2/8mL^2) (D) 25 (h^2/8mL^2) (E) 27 (h^2/8mL^2)

the correct answer is B

(A) 13 (h^2/8mL^2) (B) 22 (h^2/8mL^2) (C) 24 (h^2/8mL^2) (D) 25 (h^2/8mL^2) (E) 27 (h^2/8mL^2)

the correct answer is B