Question

Q.1.Distance travelled by light in one year in vacuum defines *

(a) light year

(b) parsec

(c) astronomical unit

(d) angstrom

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Answer 1

Answer:

A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km.

Answer 2

Step-by-step explanation:

Distance

travelled by light in one year in vacuum defines *

(a) light year