Q. The population inversion in helium-neon laser is produced by
A) Photon excitation
B) Electron excitation
C) Inelastic atomic collisions
D) Chemical reaction
Explanation
(b) The population inversion in helium-neon laser is produced by electron excitation
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.