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Concepts Of Physics MCQ Edition [Volume 1]PhysicsLight Waves

Which of the sources listed below produces the best monochromatic light?

Options

  1. AA laser
  2. BA bulb
  3. CA mercury tube
  4. DA candle

Correct answer

A. A laser

Step-by-step solution

A laser produces light that is highly coherent, directional, and monochromatic, meaning it consists of a single wavelength or color. A bulb and a candle emit light that contains a continuous spectrum of many wavelengths, making them polychromatic sources. A mercury tube emits light consisting of several discrete wavelengths, so it is not strictly monochromatic. Therefore, a laser is the best source of monochromatic light among the given options.

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