Zeeman Effect: an Alkali Metal Atom Is in the Ground

Multiple Choice

Zeeman effect: An alkali metal atom is in the ground state. The orbital angular momentum equals zero and the spin angular momentum is entirely due to the single valence electron. A magnetic field is applied that splits the ground state energy level into two levels, 27 μeV apart. What is the strength of the applied magnetic field? (h = 6.626 × 10^-34 J ∙ s, Bohr magneton = μ_B = 9.27 × 10^-24 J/T, 1 eV = 1.60 × 10^-19 J)

A) 0.23 T
B) 0.18 T
C) 0.29 T
D) 0.34 T
E) 0.40 T