Multiple choice

If in a vacuum, what is the speed with which electromagnetic light waves travel?

  1. 300 m/s

  2. 500,000 m/s

  3. 5,000,000 m/s

  4. 300,000,000 m/s
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The speed of light in a vacuum is a universal physical constant, approximately 300,000,000 meters per second (or 3 x 10^8 m/s).

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