A) time
B) speed
C) distance
D) none of these
Correct Answer: C
Solution :
Light year is unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of \[\text{3 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{8}}}\,\text{km/s}\text{.}\] So in one year it can travel about 10 trillion kilometres. More precisely 1 light year \[\text{=}\,\text{9}\text{.46}\times {{10}^{15}}\,\text{m}\] It is abbreviated by light year. It is often used to measure distances of stars.
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