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The excitation energy of a hydrogen -lik...

The excitation energy of a hydrogen -like ion in its first excited state is `40.8 eV` Find the energy needed to remain the electron from the ion

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The correct Answer is:
`54.4 eV`
`40.8=(Delta E)_(2 to 1)xxZ^(2) rArr 40.8=10.2xxZ^(2) rArr z^(2)=4 "or" Z=2`
`IE=13.6 Z^(2)=13.6xx4=54.4 eV`
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