09.29: The diagram to the right shows
dsv-3 i 1jr+ x15ymry4 xsa,iythe lowest four energy levels for an electron in a hypothetical atom. The electron is exc
,+i 5sx4 ia j11 r3yyxmsvy-drited to the -1 eV level of 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?