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 approxA. `-4.2eV`B. `-2.2eV`C. `-3.2eV`D. `-1.2eV`

photoelectron are emitted when `4000A^(0)` radiation is incident on a

1.	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 approxA. `-4.2eV`B. `-2.2eV`C. `-3.2eV`D. `-1.2eV`
Answer» Correct Answer - B `K_(max)=(hc)/lambda-phi=1.18eV,E=-(13.6eV)`

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