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

photoelectron 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 the fourth excited state is approx

A

`-4.2eV`

B

`-2.2eV`

C

`-3.2eV`

D

`-1.2eV`

Text Solution

Verified by Experts

The correct Answer is:
B
`K_(max)=(hc)/lambda-phi=1.18eV,E=-(13.6eV)`
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