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Questions and Answers
What is the speed of light in a vacuum?
What is the speed of light in a vacuum?
- 600,000 km/s
- 150,000 km/s
- 900,000 km/s
- 300,000 km/s (correct)
What is the primary source of light on Earth?
What is the primary source of light on Earth?
- Light bulbs
- Stars
- The Sun (correct)
- The Moon
Which color of light has the longest wavelength?
Which color of light has the longest wavelength?
- Yellow
- Red (correct)
- Green
- Blue
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