Laser can only be produced if an atom is in itsI. normal stateII. excited stateIII. ionized state
Correct answer: B. II only
- A. I only
- B. II only
- C. I and III
- D. II and III
Explanation
The correct answer is option B: II only. Lasers can only be produced when an atom is in its excited state. Atoms in their normal or ionized states do not generate laser light. Therefore, options A, C, and D are incorrect.
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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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