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Questions and Answers
What is the speed of light in vacuum?
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?
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?
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?
What represents the quanta of electromagnetic field for visible light?
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What is the main source of natural light on Earth?
What is the main source of natural light on Earth?
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When did nascent farmers begin planting grains?
When did nascent farmers begin planting grains?
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When were sheep, goats, pigs, and cattle domesticated?
When were sheep, goats, pigs, and cattle domesticated?
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How much of the world's farmland is operated by the largest one percent of farms?
How much of the world's farmland is operated by the largest one percent of farms?
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What percentage of agricultural land is found on farms larger than 1,000 hectares?
What percentage of agricultural land is found on farms larger than 1,000 hectares?
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How much of the world's food do small farms produce?
How much of the world's food do small farms produce?
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