Question

1. Light year is used to meaure
(a) distance between stars
(b) distance between atoms
(c) stationary charge
(d) none of these​

Answer 1

A light-year is used to measure the distance between stars

Explanation:

• Each object in our space is tremendously in a long distance.
• So, we cannot calculate it in kilometres.
• Light years are generally used to describe the distance between the objects in space since it is moving rapidly.
• Light years are defined as the distance travelled by light in an earth year.
• The distance travelled by light in a year is $9.5$ trillion km
• A parallax-second or parsecs is also used as an alternative to light year.