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He^(+) ions are excited to respective first excited states. Subsequently, H-atoms transfer their total excitation Energy to Het jons collisions). Assume that the Bohr model of atom is exactly valid. The quantum number n of the state finally populated in He+ ions is

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Solution :Energy released by H ATOM `triangleE_(H)=3/4 xx 13.6eV`
Let `He^(+)` IONS go to nth STATE. So energy required
`triangleE_(He)=13.6 xx 4 (1/4-1/n^(2))eV`
`n_(1)=4`


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