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Question

If the speed of light is equal to 3×108ms1, how many kilometers will make up 1 light year?


A

946×1013km

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B

1.095×1011km

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C

1095 km

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D

9.46×1012km

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Solution

The correct option is D

9.46×1012km


One light year is the distance travelled by light in one earth year, that is in 12 months, or 365 days.
Therefore time taken =365×24×60×60=31536×103 s
Speed of light =3×108 ms1
1 light year = speed of light x time =3×108×31536×103=9.46×1015 m =9.46×1012 km


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