1 light year distance is the:
Correct answer: C. Distance travelled by light in one year
- A. Distance travelled by earth in one year
- B. Distance travelled by a star in one year
- C. Distance travelled by light in one year
- D. Distance travelled by light in one galactic year
Explanation
A light-year is defined as the distance that light travels in one year in a vacuum. Since light travels at a constant speed of approximately 299,792 kilometers per second (in vacuum), the distance it travels in one year is about 9.461 trillion kilometres (or about 5.879 trillion miles).
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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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