If an atom has only the three energy levels shown in the figure below, ... ...

 If an atom has only the three energy levels shown in the figure below, what possible frequencies might be in the spectrum of this atom? (Use h = 4.14 x 10–15 ev s and c = 3.0 x 108 m/s.) image
(A) 7.2 x 1014 Hz
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 16. Atomic and Nuclear Physics