Understanding Visible Light
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Questions and Answers

What is the speed of light in vacuum?

  • 299,792,458 m/s (correct)
  • 400,000,000 m/s
  • 200,000,000 m/s
  • 300,000,000 m/s

    • What are the primary properties of light?

  • Reflection, refraction, diffraction, and interference
  • Energy, mass, velocity, and charge
  • Color, speed, frequency, and amplitude
  • Intensity, propagation direction, frequency or wavelength spectrum, and polarization (correct)

    • What range of wavelengths is usually defined as visible light?

  • 350–750 nanometres (nm)
  • 200–500 nanometres (nm)
  • 400–700 nanometres (nm) (correct)
  • 600–800 nanometres (nm)

    • What represents the quanta of electromagnetic field for visible light?

    <p>Photons</p> Signup and view all the answers

    What is the main source of natural light on Earth?

    <p>The Sun</p> Signup and view all the answers

    When did nascent farmers begin planting grains?

    <p>105,000 years ago</p> Signup and view all the answers

    When were sheep, goats, pigs, and cattle domesticated?

    <p>Around 10,000 years ago</p> Signup and view all the answers

    How much of the world's farmland is operated by the largest one percent of farms?

    <p>More than 70 percent</p> Signup and view all the answers

    What percentage of agricultural land is found on farms larger than 1,000 hectares?

    <p>Nearly 40 percent</p> Signup and view all the answers

    How much of the world's food do small farms produce?

    <p>About a third</p> Signup and view all the answers

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