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\[3\times {{10}^{8}}m/s\]. So in one year it can travel about 10 trillion kilometers. More precisely 1 light year\[=9.46\times {{10}^{15}}m\] It is abbreviated by light year. It is often used to measure distance of stars.
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