1. The problem statement, all variables and given/known data Nuclear magnetic resonance in water is due to the protons of hydrogen. Find the field necessary to produce NMR (nuclear magnetic resonance) at 60 MHz. 2. Relevant equations These are the equations I think I'm supposed to use: omega (subscript zero) = gamma * B (subscript zero) (omega is frequency, B is magnetic field) B sub 0 = (omega sub zero) / (ge/2m) 3. The attempt at a solution I know that gamma = ge/2m, and g is the gyromagnetic ratio, but do I use g for electrons (g = 2???) and e as the electron charge? The problem states that the nuclear magnetic resonance in water is due to protons, so do I use the g for water? e can only be one thing, right (1.6 * 10^-19) and for m, do I use the mass of an electron or a proton??? The equations are not complicated for this problem, but I'm confused about what constants to use (protons or electrons???). Please help! Thanks!