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Question

If the speed of light is 3×108ms, determine the distance it takes in 1light year. Report your results in km and in m.


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Solution

Step 1. Given data:

Speed of light = 3×108ms

Time = 1 Light year = 365×24×3600=3,15,36,000sec

Step 2. Formula used:

Distance traveled in one light-year S = Speed v x time t

S=v×t

Step 3. Calculating distance

Hence, distance S = 3×108×3,15,36,000=9.5×1015m=9.5×1012km

Hence, distance is 9.5×1012kmor9.5×1015m


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