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Concept of Day, Hour, Minute, Second

Which unit is...

Question

Which unit is used to measure distance of light travelled in one year?

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Solution

Dear Student ,

The distance that light travels in one year is called the light year.
One light year = 9460730472580.8 km.

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Q. Assertion :A light-year is a distance that light travels with velocity of

3 \times 10^{8}

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in one year. Reason: Light year is the unit for measuring time.

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Q. Match the following
1. Light year
2.Astronomical unit
3. Parsec
I. Distance from earth to a star with a parallax of 1 arc second
II. Distance between the sun and earth. It is used to measure distance within the solar system.
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Q. The distance travelled by light in one year is called

Q. Assertion (A): Light year is the unit of time.

Reason (R): Light year is the distance travelled by light in vacuum in one year.

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