Consider a two-dimensional square potential energy well with sides of length l. the potential energy is infinite at the sides and zero inside. the single-particle energies are given by (h2/8ml2)(m + n, where nr and ny are integers. report all energy values in units of (h/8ml2) (a) (5 points) what is the energy of the ground state? (b) (5 points) what is the energy of the first excited state? (c) (5 points) what is the degeneracy of the first excited state? (d) (10 points) if we put three electrons into this potential energy well, what would the energy of the ground state be?