In He-Ne laser, lasing gas is
Correct answer: C. both He and Ne
- A. He
- B. Ne
- C. both He and Ne
- D. hydrogen
Explanation
C is the right option In a He-Ne laser, the lasing gas is a mixture of helium (He) and neon (Ne). Helium is used to excite neon atoms to higher energy states, and the lasing action occurs when the excited neon atoms return to their lower energy states, emitting coherent light.
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Atoms emit or absorb light at specific wavelengths because electrons occupy quantized energy levels and change levels by absorbing or releasing photons. The topic covers emission and absorption spectra, spectral series, hydrogen’s line spectrum, energy-level transitions, and the relation between wavelength, frequency and photon energy.
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