Q.

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
Answer» D. All of the above
Explanation: 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.
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