The speed of light is approximately 3 × 10⁸ m/s. There are approximately 3.16 × 10⁷ seconds in 1 year. Use these values to work out how far a beam of light will travel in 1 year. Give your answer to 2 significant figures.




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The speed of light is approximately three times 10 to the power of eight meters per second. There are approximately 3.16 times 10 to the power of seven seconds in one year. Use these values to work out how far a beam of light will travel in one year. Give your answer to two significant figures.

Okay, so let’s start by underlining all the important stuff given to us in the question. First of all, we’ve been given the speed of light. That happens to be three times 10 to the power of eight meters per second. Secondly, we’ve also been given the number of seconds in one year.

What we’ve been asked to do is to work out how far — that is, we have to work out a distance — how far the beam of light will travel in one year.

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We also know that we need to give our answer to two significant figures.

So in this question, we’ve been given two quantities: the speed of light first of all, which is normally labelled