Calculate the form of the Zeeman Effect, which occurs when a homogeneous magnetic field of4.0 T (40 kG) is applied to a hydrogen atom in which the transition from the 2p- to the 3d-state is monitored. Which transitions are allowed (considering also the magnetic quantum numberselection rule! Δml= 0,±1), how many lines can be seen in the absorption spectrum and what aretheir energies? Please provide me with an explanation of what are the selection rules about.