09.29: The diagram t
dmrmsn7)j1 8qc3 aqqlac+ (m7 o the right shows the lowest four energy levels for an electron in a hypothetical atom. The electron is excited to the -1 eV level
d s(mn m1 q7r)c+3q7 aqja8mclof the atom and transitions to the lowest energy state by emitting only two photons. Which of the following energies could not belong to either of the photons?