Light year is the unit of:
Correct answer: B. Distance
- A. Time
- B. Distance
- C. Light
- D. Velocity
Explanation
The light year is primarily used to express astronomical distances. It represents the distance that light travels in one year in a vacuum. Since the speed of light is approximately 299,792 kilometers per second, a light year is about 9.461 trillion kilometers.
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About Measurements
Physical quantities are expressed with SI base and derived units, while measurement limits are described through accuracy, precision, absolute and percentage error, and significant figures. Dimensional analysis checks equations, derives relationships and detects inconsistent units, but it cannot determine numerical constants or distinguish quantities with identical dimensions.
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