Can electron in ground state of a hydrogen atom absorb a photon of energy less than 13.6 Mev?
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An electron bound to an atom—that is, having insufficient energy to overcome the attractive force of the nucleus—can only exist in certain, discrete energy levels. However, an unbound (free) electron is under no such constraint. It has a continuous range of allowed energies and is said to be “in the continuum.”
13.6 eV is the minimum amount of energy needed to liberate a ground state electron in hydrogen. Anything more just means that the electron enters the continuum with more kinetic energy.
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