<Dd> ψ n x, n y = ψ n x (x, t, L x) ψ n y (y, t, L y) (\ displaystyle \ psi _ (n_ (x), n_ (y)) = \ psi _ (n_ (x)) (x, t, L_ (x)) \ psi _ (n_ (y)) (y, t, L_ (y))), </Dd> <Dl> <Dd> E n x, n y = ħ 2 k n x, n y 2 2 m (\ displaystyle E_ (n_ (x), n_ (y)) = (\ frac (\ hbar ^ (2) k_ (n_ (x), n_ (y)) ^ (2)) (2m))), </Dd> </Dl> <Dd> E n x, n y = ħ 2 k n x, n y 2 2 m (\ displaystyle E_ (n_ (x), n_ (y)) = (\ frac (\ hbar ^ (2) k_ (n_ (x), n_ (y)) ^ (2)) (2m))), </Dd> <P> where the two - dimensional wavevector is given by </P>

Why cannot a particle in a infinitely deep potential well have zero energy