What is the speed of light in vacuum?
Answer and explanation
Correct answer: A. 3 x 10^8 m/s
- Step 1: Light travels at about 300 million metres per second. Answer: 3 x 10^8 m/s. Why not the others: 3 x 10^6 m/s, 3 x 10^10 m/s and 340 m/s don't fit.
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