In a collection of these objects excited by an electron beam, all five states are occupied. What are the possible energies of photons emitted? Choose all the possible energies of the emitted photons from the checkbox below.
1 eV 2 eV 3 eV 4 eV 5 eV 6 eV 7 eV 8 eV 9 eV 10 eV 11 eV 12 eV 13 eV 13 eV 14 eV 15 eV 16 eV 17 eV 18 eV 19 ev 20 eV
Note: Make sure you select all of the correct options—there may be more than one!