If ioinsation potential of hydrogen atom is 13.6 eV, then ionisation potential of `He^(+)`will be
If ioinsation potential of hydrogen atom is 13.6 eV, then ionisation potential of `He^(+)`will be
A. 54.4 eV
B. 6.8 eV
C. 13.6 eV
D. 24.5 eV
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