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photoelectron are emitted when 4000A^(0)...

photoelectron are emitted when `4000A^(0)` radiation is incident on a surface of work function `1.9eV`. these photoelectrons pass through a region has `alpha` particles to form `He^(+)` ion, emitting a single photon in this process `He^(+)` ions thus formed are in their fourth excited state.
Energy released during during the combination of `He^(+)` ions is

A

5.38 eV

B

3.38 eV

C

2.38 eV

D

1.38 eV

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The correct Answer is:
B
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