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      Question

      The speed of light is very nearly equal to 3 Γ—

      1017 nanometre per second. How much time (in seconds), approximately, does it light to travel from the moon to the earth, the average distance between t hem being 38400 km? (1 nanometre = 10–9 metre)
      A 38.4 Correct Answer Incorrect Answer
      B 12.8 Correct Answer Incorrect Answer
      C 3.84 Correct Answer Incorrect Answer
      D 1.28 Correct Answer Incorrect Answer

      Solution

      The correct answer is D

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