PDE Q49
- Option : B
- Explanation :
A light year is a unit of distance. It represents the distance that light travels in one year in a vacuum, which is approximately 9.46 trillion kilometers. It is commonly used to measure distances between stars and galaxies.
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Option A: Intensity of light
Incorrect. Light intensity is measured in units like lumens or candela, not light years. -
Option B: Distance
Correct. A light year measures how far light travels in a year. -
Option C: Time
Incorrect. Although it includes the word "year," it is not a unit of time. -
Option D: Planetary motion
Incorrect. Planetary motion is usually described in terms of orbital period, velocity, or distance, but not
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