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An excited He^(+) ion emits two photons ...

An excited `He^(+)` ion emits two photons in succession with wavelengths 108.5nm and 30.4 nm, in making a transition to ground state. The quantum number n, corresponding to its initial excited state is (for photon of wavelength `lamda` energy
`E=(1240eV)/(lamda("in cm"))`

A

`n=4`

B

`n=5`

C

`n=7`

D

`n=6`

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The correct Answer is:
A
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