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      Question

      What is the speed of light in a

      vacuum?
      A 3 Γ— 10⁸ m/s Correct Answer Incorrect Answer
      B 1.5 Γ— 10⁸ m/s Correct Answer Incorrect Answer
      C 2.5 Γ— 10⁸ m/s Correct Answer Incorrect Answer
      D 3.5 Γ— 10⁸ m/s Correct Answer Incorrect Answer

      Solution

      Light travels at an incredible speed of 3 Γ— 10⁸ m/s in a vacuum. This is the universal constant for electromagnetic waves. It decreases slightly in mediums like air or water.

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