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

phtoelectron are emitted when `4000A^(0)` radiation is incident on a surface of work fuction `1.9eV`. these photoelectrons pass through a region has a- particles to form `He^(+)` ion, emitting a single photon in this process `He^(+)` ions thus formed are in their fourth excited state.
Energy of emitted photon in range of `3eV` & `4eV` after combination is

A

`3.86eV`

B

`3.24eV`

C

`3.29eV`

D

`5.24eV`

Text Solution

Verified by Experts

The correct Answer is:
A
For de-excitation from `n=5` to `n=3`, E=3.86eV`
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