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NDA2021General AbilityGeneral ScienceActual

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 ?

Options

  1. A1,2 and 3
  2. B2 and 3 only
  3. C1 and 2only
  4. D1 only

Correct answer

B. 2 and 3 only

Step-by-step solution

- Light-year, in astronomy, the distance traveled by light moving in a vacuum in the course of one year, at its accepted velocity of 299,792,458 metres per second ( 186,282 miles per second). - A light-year equals about 9.46073 10¹² ~km ( 5.87863 10¹² miles), or 63,241 astronomical units. - It is a unit of distance. It is the distance a light photon travels in the vacuum in one Julian year. Denoted byly. - It's defined by how far a beam of light travels in one year - a distance of six trillion miles.

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