Discussion
Light year is a unit of
Answer: B
A light year is a unit of distance.
It is the distance light travels in a vacuum in one year, about \(9.46 \times 10^{12}\) km. Astronomers use it for distances between stars.
The word year makes 'time' the obvious trap, but a light year measures how far, not how long. It is not a unit of light itself or of light's intensity (which is measured in candela).
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