1a. From data 111-Cd at ground level has magnetic moment of -0.5940 nm, the 245 keV levels has a magnetic moment of -0.766 nm.
µ=g µ_N I therefore g=µ/(µ_N I).
I has the values 1/2 and 5/2 respectively.
µ_N is unknown.
1b. µ=1 mµ_B therefore 1=g I Thus g=2 since electrons have I=1/2.