Consider the following statements about Light year : Light year is

Consider the following statements about Light year :

Light year is a unit for measurement of very large distances.
Light year is a unit for measurement of very large time intervals.
Light year is a unit for measurement of intensity of light.

Which of the statements given above is/are correct ?

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1, 2 and 3

2 and 3 only

1 and 2 only

1 only

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC NDA-1 – 2021

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Statement 1 is correct, while statements 2 and 3 are incorrect. A light-year is a unit of distance.

A light-year is defined as the distance that light travels in vacuum in one Julian year (365.25 days). It is used to measure very large distances, particularly in astronomy.

The approximate value of a light-year is 9.461 × 10¹⁵ meters or 63,241 astronomical units (AU). Other units of astronomical distance include the astronomical unit (AU) and the parsec (pc). The parsec is defined based on parallax and is approximately 3.26 light-years.

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