An electron in a hydrogen atom in its ground state absorbs energy equal to ionisation energy of li2+
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ionization energy of lithium is 122.4eV and the energy needed to eject electron from hydrogen atom in the ground state is 13.6eV. So to calculate say for instance wavelength of the emitted electron, you can use De Broglie equation wavelength = h/v where h is the Plancks constant and v is velocity.
velocity can be given by 2m x kinetic energy and m is the mass of electron.
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Answer: 1.17 Angstrom
Explanation:Calculate energy emitted by H and substitute it in De Broglie equation
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