An Atom Emits Light at Various Wavelengths, Two of Which

An atom emits light at various wavelengths, two of which are 434 nm and 472 nm. Both of these transitions are to the same final state. What is the energy difference between the two states for each transition ?

A) 1.2 × 10 ^{− 19} J
B) 3.4 × 10 ^{− 19} J
C) 3.7 × 10 ^{− 20} J
D) 4.2 × 10 ^{− 20} J