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A sample of hydrogen atom in its ground ...

A sample of hydrogen atom in its ground state is radiated with photons ground state is radiated with photons of 10.2 eV energies. The radiation from the sample is absorbed by excited ionize absorbed by excited ionized `He^(+)` . Then which of the following statement/s is/are true ?

A

`He^(+)` electron moves from n = 2 to n = 4.

B

In the `He^(+)` emission spectra, there will be 6 lines..

C

Smallest wavelength of `He^(+)` spectrum is obtained when transition taken place from n = 4 to n = 3.

D

`He^(+)` electron moves from n = 2 to n = 3.

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