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In ground state of He^(oplus) ion how mu...

In ground state of `He^(oplus)` ion how much energy is supplied to electron so that second line of balmer series is obtained in its spectrum `:-`

A

`10.2`eV

B

`48.36`eV

C

`51`eV

D

None of these

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The correct Answer is:
C
`N//A`
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