Question

Light year is a unit of:

• A. time
• B. speed
• C. distance
• D. none of these

Answer 1

Answer: (C)

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.