An S State (L = 0) Energy Level Is Split

Multiple Choice

An s state (l = 0) energy level is split into two levels by an applied magnetic field. A photon of microwave radiation having frequency 60 GHz induces a transition between the two levels. What is the magnitude of the applied magnetic field? (h = 6.626 × 10^-34 J ∙ s, Bohr magneton = μB = 9.27 × 10^-24 J/T)

A) 2.1 T
B) 0.34 T
C) 1.2 T
D) 2.8 T
E) 13 T