Quantum Mechanics Answers

a) Calculate the components of energy along x, y and z axes and the total energy for an electron in a cubical box of length 10^-9 m, if nx = 3, ny =nz =1. State the values of nx, ny and nz for two other energy states which are degenerate with this level.

Hint: Use the principle of calculation of energy of a particle in the three dimensional box. (5)

For the ground state of linear harmonic oscillator calculate average value of "x" and "x^2".

why Heisenberg's uncertainty principle is insignificant for macroscopic particles such as moving car or ball?

Have Schlesinger equation an unique answer? Why or why not?

what is difference between degenerate and non degenerate energies in quantum physics ?

Hi,

I am thinking for some hours about the commutation of the field-Operator/(annihilation-Operator): $$\Psi$$ and the vector-potential: $$\vec{A(\vec{r})}$$.

I have noticed in my lecture notes that $$\vec{A(\vec{r})}\Psi = \Psi\vec{A(\vec{r})}$$.

But I don't understand why they commute?

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