4. A proton and an electron recombine to form atomic hydrogen in its 4p state. At what wavelengths will recombination lines be observed? Label each wavelength by its standard series notation. How would the observed emissions differ if the atoms had recombined to the 4s level? (This means that the initial state is the 4p state. Determine all possible transition where a photon is emitted after the formation of the 4p state including cascading transitions. Apply selection rules)

4. A proton and an electron recombine to form atomic hydrogen in its 4p state. At what wavelengths will recombination lines be observed? Label each wavelength by its standard series notation. How would the observed emissions differ if the atoms had recombined to the 4s level? (This means that the initial state is the 4p state. Determine all possible transition where a photon is emitted after the formation of the 4p state including cascading transitions. Apply selection rules)