1. The problem statement, all variables and given/known data One of a He+ atom is in a pure state |1,0,0>. What is the energy of this state? Give a numerical answer in eV. Another of these is found to be in a mixed state: |si>=[1/(3^1/2)][2^1/2|2,1,0>+|2,1,-1>. Calculate the following expectation values at t=0; <E>,<Lz>,<Lx> HINT: start by writing Lx in terms of the raising and lowering operators, L+ and L- 2. Relevant equations ??? 3. The attempt at a solution I think I'm supposed to calculate the ground state? I'm not sure what formula to use.