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Consider the following statements about Light year: 1. Light year is a unit for measurement of very large distances. 2. Light year is a unit for measurement of very large time intervals. 3. Light year is a unit for measurement of intensity of light. Which of the statements given above is/are correct?

Consider the following statements about Light year: 1. Light year is a unit for measurement of very large distances. 2. Light year is a unit for measurement of very large time intervals. 3. Light year is a unit for measurement of intensity of light. Which of the statements given above is/are correct? Correct Answer 1 only

CONCEPT:

  • Length is a measure of the size or distance between two points. The SI unit of length is the meter (m).
  • Light year: It is the distance travelled by light in one year. 
    • A light-year is a convenient unit of measurement of large distances.
    • Generally, a light-year is used to represent astronomical distances. 
    • One light-year is approximately 9 trillion (9 × 1012) km.

EXPLANATION:

  • A light-year is a unit of length. Therefore option 4 is correct.​​
  • It is the distance travelled by light in a vacuum in one year.
  • A light-year is used in astronomy to measure the distances of nearby stars.

⇒ 1 light-year = 1ly = 9.467 × 1015 m

Additional Information

Parsec (parallactic second):

  • It is the largest practical unit of distance used in astronomy.
  • It is defined as the distance at which an arc of the length of 1 astronomical unit subtends an angle of 1 second of arc.

⇒ 1 parsec = 3.08 × 1016 m

Astronomical unit:

  • It is defined as the mean distance of the earth from the sun. It is used in astronomy to measure the distance of planets.

 1 astronomical unit = 1 AU = 1.496 × 1011 m

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