Let En = -1me^4/ 8e^20 n^2 h^2 be the energy of the nth level of H-atom. If the H-atom are in the ground state and radiation of frequency (E2 – E1)/h falls on it. Let En = -1me^4/ 8e^20 n^2 h^2 be the energy of the nth level of H-atom. If the H-atom are in the ground state and radiation of frequency (E2 - E1)/h falls on it. June 9, 2021 Category: Chapter 12 - Atoms , NCERT Exemplar Class 12 , Physics , Facebook Messenger WhatsApp Share this:TwitterFacebook Related