A LASER is produced as A excited electron falling to ground state B ground state electron moving to an excited state C excited proton falling to ground state D ground state proton moving to an excited state

Answer 1

A LASER (Light Amplification by Stimulated Emission of Radiation) is produced when an excited electron falls to a lower energy state, specifically the ground state. Therefore, the correct option from your list is:

A. excited electron falling to ground state

In this process, the electron transitions from an excited energy level to a lower energy level, emitting a photon in the process. This photon can stimulate other excited electrons to emit more photons, leading to a cascade effect and the amplification of light, characteristic of laser operation.