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Light - year is the unit of 
1. energy
2. intensity
3. age
4. distance

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Correct Answer - Option 4 : distance

The correct answer is distance.

  • Light-year is the unit of distance.
    • The light-year is a unit of length used to express astronomical distances.
    • It is equal to about 9.46 trillion kilometers (9.46×1012 km) or 5.88 trillion miles (5.88×1012 mi).
    • A light-year is a distance that light travels in a vacuum in one Julian year (365.25 days).
    • Because it comprises the word "year", the term light-year is sometimes misinterpreted as a unit of time.

  • The 7 basic units of measurement are
    • Length - Meter
    • Time - Second
    • Amount of Substance - Mole
    • Electric Current - Ampere
    • Temperature - Kelvin
    • Luminous Intensity - Candela
    • Mass - Kilogram

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