The phenomenon in which a proton flips is

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(A) Nuclear Magnetic Resonance $(NMR)$ is a physical phenomenon in which nuclei in a strong constant magnetic field are perturbed by a weak oscillatin

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nuclear magnetic resonance

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(A) Nuclear Magnetic Resonance $(NMR)$ is a physical phenomenon in which nuclei in a strong constant magnetic field are perturbed by a weak oscillating magnetic field (in the near-field) and respond by producing an electromagnetic signal with a frequency characteristic of the magnetic field at the nucleus. This process involves the flipping of the spin state of protons (or other nuclei with non-zero spin) between energy levels when they absorb energy from an external radio-frequency field.

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