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Calculate the ratio of energies of He^(+...

Calculate the ratio of energies of `He^(+)` for `1^(st) & 2^(nd)` excited state.

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`{:(,(He^(+))1^(st)"Excited state",:,(He^(+))_(2)2^(nd)"Excited state"),(,"i.e"(He^(+))2^(nd)"shell",:,(He^(+))3^(rd)"shell"),(,,,),(,-13.6xx((2)^(2))/((2)^(2)),:,-13.6xx((2)^(2))/((3)^(2))),(," "(4)/(4),:,(4)/(9)),(," "(1)/(4),:,(1)/(9)),(," "9,:,4):}`
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