Landé g factor in the Zeeman Effect

[FatPhysicsBoy]

Homework Statement

A source which emits a line at 500 nm is found to exhibit the normal Zeeman effect
when placed in a magnetic field. Calculate the magnetic field given that the separation
of adjacent components in the Zeeman pattern is 12.0 pm.

Homework Equations

E=hc/lambda, ΔE = - μ B

The Attempt at a Solution

So I've already gone through all the work of calculating ΔE, and μ and subsequently calculating B to be ~0.5T however I have a problem in that in the expression for my B I have ΔE on top and gμ_b at the bottom.

I chose to select g = 2 as my Landé g factor however it's a little bit ambiguous, I'm not sure whether it ought to be g = 1 in which case my value for B would be doubled to ~ 1T

Any help would be much appreciated thank you!

 

[TSny]

For normal Zeeman Effect g = 1.