In He - Ne Iaser, the active material is:
Correct answer: C. Both He and Ne
- A. He only
- B. Ne only
- C. Both He and Ne
- D. None of the above
Explanation
In a He-Ne laser, the active material is a mixture of helium (He) and neon (Ne) gases. The helium provides the energy to excite the neon atoms, which then emit light at a specific wavelength. So, both helium and neon are involved in the laser's operation.
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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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