Question

which phrases accurately describe a light year?
(pick all that apply)
the shape of a galaxy
the distance that light travels in a year
9.46 trillion kilometers (5.88 trillion miles)
a yearly measurement of light given off by stars
the amount of time it takes light to travel 1 million kilometers

Answer 1

Answer:

the distance that light travels in a year

9.46 trillion kilometers (5.88 trillion miles)

Explanation:

Light year : It is defined as the distance traveled by light in a time period of one year.

So , 1 light year = Speed of light x Time

we know that, speed of light = 3 x 10⁸ m/s

Time = 365 days = 365 x 24 hours = 365 x 24 x 3600 sec

hence

1 light year = (3 x 10⁸ ) x (365 x 24 x 3600)

1 light year = 9.46 x 10¹⁵ m

1 light year = 9.46 x 10¹² km

1 light year = 9.46 trillion kilometers