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The operating frequency of a magnet is calculate from the [[Larmor equation]]: <math>F_\mathrm{larmor} = \gamma * B_0</math>, where <math>B_0</math> is the actual strength of the magnet in units like [[tesla (unit)|teslas]] or [[gauss]], and <math>\gamma</math> is the [[gyromagnetic ratio]] of the nucleus being tested.
Chemical shifts are different for dfferenty types of atoms; fro example, in 1H-NMR methanol will give two peaks beacause there are two different types of hydrogen atoms in methanol molecule.
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