An electron in the infinite well of length L = 0.5 nm is initially in the n = 4 state. It drops to n = 3 state and emits a photon γ₄₃. Another electron nearby is in the ground state of a harmonic oscillator potential. When the electron in the harmonic oscillator absorbs the photon γ₄₃, it makes a transition to the 4^th excited state.

What is the ground state energy of this harmonic oscillator?

E_Ground = eV