21. In a Laser (say neon laser) all the atoms emit the light waves of A.Same frequency B.Same amplitude C.Same phase D.All of the above
Option D Solution: In a Laser all the atoms emit the light waves of same frequency, amplitude and phase. A laser is a device that emits light (electromagnetic radiation) through a process of optical amplification based on the stimulated emission of photons. The term “laser” originated as an acronym for Light Amplification by Stimulated Emission of Radiation.
