An electron of kinetic energy 100 eV collides with a

Last updated: 6/9/2023

An electron of kinetic energy 100 eV collides with a stationary helium ion He in its ground state and excites it to a higher level After collision He ion emits two photons in succession with wavelengths 1085 A and 304 A Find the kinetic energy of electron after collision Neglect the recoil speed of He ion