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RRB Group-D Model Paper 18 with answers for online practice
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© examsnet.com
Question : 38
Total: 100
Light Year is used for measurement of ______.
Temperature
light intensity
Time
Distance
Validate
Solution:
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) per second.
So one light-year is equal to
9.5
*
10
12
kilometers.
This light-year distance is known as the Astronomical Unit (AU).
Distances to other parts of the Milky Way Galaxy or even further, astronomers use units of the light-year or the parsec.
1 light-year in miles = 5.88 × 1012 miles.
1 light-year in Astronomical unit = 63241 au.
The distance between the sun and earth is 15.54795 × 10-6 light-years.
Light-Year also helps to determine the age of the celestial body.
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