In population inversion (Ruby Laser) atoms can reside in the excited state for:
Correct answer: C. 10-3
- A. 10-11
- B. 10-8
- C. 10-3
- D. 10+3
Explanation
In the context of population inversion in a Ruby laser, the correct answer is that atoms can reside in the excited state for a relatively long time, typically in the order of 10^-3 seconds (or 1 millisecond).
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Quantum theory treats electromagnetic radiation as packets of energy called photons, with energy proportional to frequency through E equals hf. The topic covers Planck's hypothesis, photon momentum, the photoelectric effect, threshold frequency, work function and wave particle duality, distinguishing quantised energy exchange from classical continuous radiation.
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