When an electron in a hydrogen atom changes its spin from the same to the opposite direction as the proton, it

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When an electron in a hydrogen atom changes its spin from the same to the opposite direction as the proton, it involves a change in the magnetic moment of the atom, which is a relatively low-energy transition. This transition emits a photon in the radio wave frequency range, which is characteristic of the energy changes associated with spin flips in nuclear magnetic resonance (NMR) and electron spin resonance (ESR) phenomena.

When an Electron in a Hydrogen Atom Changes Its Spin