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In 1945, Edward Purcell, Robert Pound and Henry Torrey worked on the development of radar during World War II at MIT Radiation Laboratory. Purcell, who had led the group, had been successful on the production and detection of radio frequency power and on the absorption of such radio frequency power. Purcell's work led to the discovery of nuclear magnetic resonance (NMR). \\\\   Nuclear magnetic resonance studies the occurrence in which nuclei in a magnetic field absorb absorbs  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. \\ \\