Question: A cubical box of widths Lx = Ly = Lz = L contains an electron. What multiple of h2l8mL2, where m is the electron mass,

A cubical box of widths Lx = Ly = Lz = L contains an electron. What multiple of h2l8mL2, where m is the electron mass, is?
(a) The energy of the electron's ground state,
(b) The energy of its second excited state, and
(c) The difference between the energies of its second and third excited states? How many degenerate states have the energy of?
(d) The first excited state and
(e) The fifth excited state?

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