09.29: The diagram to the right shows the lowest four energy lev
/-uobtmktc*cf:v /oy)c2yu4 1sg y/z els for an electron in a hypothetical atom. The electron is excited to the -1 eV level of the atom and transitions to the lowest energy st
/ )bouztcuv- yymscg1k*fo4 y/tc2:/ ate by emitting only two photons. Which of the following energies could not belong to either of the photons?