Light year is a measure of

[amp_mcq option1=”time” option2=”distance” option3=”total amount of light falling on the Earth in a year” option4=”average intensity of light falling on the Earth in a year” correct=”option2″]

This question was previously asked in

UPSC NDA-2 – 2017

Download PDF Attempt Online

A light-year is defined as the distance that light travels in vacuum in one Julian year (365.25 days). Because light travels at a finite, constant speed in vacuum, the distance it covers over a fixed period of time is a specific value. Therefore, a light-year is a unit used to measure distances, particularly in astronomy, for vast interstellar and intergalactic scales.

– A light-year is the distance light travels in one year.
– It is a unit of distance.
– Used for measuring large distances in astronomy.

The speed of light in vacuum is approximately 299,792,458 meters per second. One light-year is approximately 9.461 trillion kilometers (9.461 × 10¹² km) or 5.879 trillion miles (5.879 × 10¹² miles). Other units of astronomical distance include the astronomical unit (AU) and the parsec (pc).

More similar MCQ questions for Exam preparation:-