Find the quantum of the excited state of electrons in `He^(+)` ion which on transition to first excited state emit photons of wa

Find the quantum of the excited state of electrons in `He^(+)` ion which on transition to first excited state emit photons of wavelengths `108.5 nm`. `(R_(H)=1.09678xx10^(7) m^(-1))`
A. `6`
B. `5`
C. `4`
D. `2`

Find the quantum of the excited state of electrons in `He^(+)` ion which on transition to first excited state emit photons of wavelengths `108.5 nm`.

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