At what minimum Kinetic energy of a moving hydrogen atom

Last updated: 6/7/2023

At what minimum Kinetic energy of a moving hydrogen atom will its inelastic head on collision with another stationary hydrogen atom produce a photon emitted by one of the atoms Both the of the atom are supposed to be in ground state prior to collision momentum of photon is negligible and no heat is lost A 10 2 eV C 13 6 eV B 20 4 eV D none