A hydrogen atom is in an excited state of principal quantum number n . It emits a photon of wavelength λ when it return to the ground state. The value of n is A hydrogen atom is in an excited state of principal quantum number n . It emits a photon of wavelength λ when it return to the ground state. The value of n is June 5, 2021 Category: Cengage JEE Mains Physics by B.M Sharma , Chapter 29 - Atomic Structure , Facebook Messenger WhatsApp Share this:TwitterFacebook Related