An electron is in an infinite square well (a box) that is 8 nm wide. The electron makes a transition from then 3 to the n 2 state, what is the wavelength of the emitted photon? (h 6.626 × 10⁻³⁴ J . s mₑₗ-9.11 × 10⁻³¹ kg, 1 eV = 1.60 × 10⁻¹⁹)
A. 2.7x10⁴ nm
B. 4.2×10⁴ nm
C. 1.6x10⁴ nm
D. 3.1x10⁴ nm
E. 2x10⁴ nm