A laser is a device that can produce:
Correct answer: D. All of the above
- A. Intense beam of light
- B. Coherent beam of light
- C. Monochromatic beam of light
- D. All of the above
Explanation
A laser is a device that produces an intense, coherent, and monochromatic beam (made of rays) of light. Laser light is different from typical light sources as the beam produced is coherent and monochromatic. Coherent refers to the fact that all the light rays in the beam are in phase, i.e., the troughs of all the light waves in the beam line up together, as do all the crests. Laser light is monochromatic, which means all of the light produced by the laser is of a single wavelength.
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Classical physics cannot explain blackbody radiation and related observations, leading to Planck’s quantum theory, in which energy is emitted or absorbed in discrete packets. Photons provide the particle model of light, with energy and momentum linked to frequency and wavelength, including the photoelectric effect and its threshold frequency.
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