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Photo electrons are emitted when 400nm radiation is incident on a surface of work function 1.9eV. These photelctrons pass through a region containing alpha particles. A maximum energy electron combines with an alpha particleto form He+ ion, emitting a single photon in this process. He+ ions thus formed are in their fourth excited state. find the energies in eV of the photons lying in 2 to 4eV range, that are likely to be emitted during and after the combination?


Photo electrons are emitted when 400nm radiation is incident on a surface of work function 1.9eV. These photelctrons pass through a region containing alpha particles. A maximum energy electron combines with an alpha particleto form He+ ion, emitting a single photon in this process. He+ ions thus formed are in their fourth excited state. find the energies in eV of the photons lying in 2 to 4eV range, that are likely to be emitted during and after the combination?    


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