Multiple choice

One light-hour is the distance that light travels in an hour. How far is this in kilometres?

  1. 100 million km

  2. 300,000 km

  3. 18 million km

  4. 1.08 billion km
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D Correct answer
Explanation

One light-hour is the distance that light travels in an hour which is 1.08 billion km. It is the distance light travels in a vacuum in one hour.

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