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Question

Light year is the unit of the


A

Distance

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B

Time

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C

Speed

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D

Intensity of light

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Solution

The correct option is A

Distance


Explanation for the correct option

Option (A)

  1. Light-year is the unit of length to measure large distances (astronomical distances).
  2. The total distance travelled by light in a year is called 1 light year.
  3. 1 light-year = 9.46 × 1012 km.

Explanation for the incorrect options

  1. The second is the unit of time.
  2. Meter/second is the unit of speed.
  3. Candela is the unit of light intensity.

Therefore, Light-year is the unit of distance. Hence, option (A) is correct.


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