Question

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

Answer 1

Answer

Unit of Distance travel by light in a year is knows as light year journey .

Light can travel 30,000km/ second hence in one year it can travel about 10 trillion kilometer

Answer 2

Distance travelled by light in one year in vacuum defines one light year of distance.

• There are different types of units of length which we use to smaller or bigger lengths.
• Now, in the cases of huge astronomical lengths we cannot use the general units of lengths because usage of these units will provide us a large numerical value.
• That's why, we use a comparatively larger unit which is known as the light year or the distance travel by the light in vacuum in the time of one year.
• One light year is equal to (9.46×10¹²) kilometres.