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?

Aditi Chauhan , 10 Years ago

Grade 10