Physics · Units and Measurements
Which of the following statements is correct regarding a 'light year'?
- 1It is the time taken by light to travel from the Sun to Earth.
- 2It is a standard SI unit of time.
- 3It is the distance travelled by sound waves in one year.
- 4It is the distance travelled by light in one vacuum year.✓
Correct answer
It is the distance travelled by light in one vacuum year.
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