An electron having energy 100 eV collides with a stationary helium ion (He) in its ground state and excites to a higher level. After the collision, He ions emits two photons in succession with wavelength 1085 An electron having energy 100 eV collides with a stationary helium ion (He) in its ground state and excites to a higher level. After the collision He ions emits two photons in succession with wavelength 1085 September 11, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) , Facebook Messenger WhatsApp Share this:TwitterFacebook Related