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Nuclear magnetic resonance studies the occurrence in which nuclei in a magnetic field absorb and re-emit electromagnetic radiation. The energy that is required has to be set at the resonance frequency that depends on the strength of the magnetic field and the properties of the isotope of the atoms. \\\\  In our experiment, our apparatus (Fig.\ref{fig:TeachSpinApparatus}) studies the free precession of nuclear moments in the Earth's magnetic field. The instrument detects the collective precession of the nuclear magnetic moments in a particular sample. \\ \\   history \\  basic equations \\   basic apparatus diagram? \\