Bulbs vs Lasers
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Questions and Answers

Which one of the following is a key difference between a bulb and a laser?

  • Bulbs emit light in a single wavelength, while lasers emit light in multiple wavelengths.
  • Bulbs emit coherent light, while lasers emit incoherent light.
  • Bulbs emit light through incandescence, while lasers emit light through stimulated emission. (correct)
  • Bulbs emit light in a straight line, while lasers emit light in a scattered pattern.

Which of the following accurately describes the light produced by a bulb?

  • The light emitted by a bulb is monochromatic and incoherent.
  • The light emitted by a bulb is polychromatic and coherent.
  • The light emitted by a bulb is polychromatic and incoherent. (correct)
  • The light emitted by a bulb is monochromatic and coherent.

What is the main application of lasers?

  • Cutting and welding materials (correct)
  • Illuminating a photograph
  • Decorative lighting
  • Lighting up a room

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