The speed of light is __________?
Correct answer: B. 300,000 km/s
- A. 280,000 km/s
- B. 300,000 km/s
- C. 320,000 km/s
- D. none of these
Explanation
Light travels in vacuum at approximately 300,000 km/s, or 3.0 × 10⁸ m/s. Its speed is slightly lower in air and substantially lower in materials such as glass or water.
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