Laser light differs from ordinary light mainly in that it is
Correct answer: B. monochromatic, coherent and highly directional
- A. faster
- B. monochromatic, coherent and highly directional
- C. always more intense at every wavelength
- D. invisible
Explanation
A single transition supplies essentially one wavelength, stimulated emission keeps the waves in phase, and the resonant cavity makes the beam nearly parallel, which is why it can be focused to a very small spot. All light travels at the same speed in a vacuum, so speed is never the difference. These properties are what make lasers useful in surgery, fibre optics and CD players.
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About Atomic Spectra
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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