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Describe your approach to determining the distance between the electron and proton in an atom if the potential energy U of the electron is
known to be 14 eV.
а.
Use the law of conservation of energy.
b. Use Coulomb's law.
С.
Use the definition of electrostatic potential energy U of one point charge q at position r in the presence of an electric potential.
d. Use Newton's second law.

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