Helium-neon lasers are used for the:
Correct answer: C. Surveying for construction of tunnels
- A. Precise measurement of range finding
- B. Optical fiber communication systems
- C. Surveying for construction of tunnels
- D. Welding detached bone of body
Explanation
Helium-neon lasers serve in industrial alignment to determine straight lines with the laser beam in the construction of buildings, tunnels, and sewer pipes because they are inexpensive and provide continuous, visible output.
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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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