Physics A-Level
Light year
What Light year means in Physics A-Level, as defined for AQA.
Definition of Light year
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Read the wording for your board, then hide it and explain Light year in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
The distance electromagnetic radiation travels through a vacuum in one year, found from speed × time with c = 3.00 × 10⁸ m s⁻¹.
Topics that use Light year
- Absolute magnitude, M (A-level only) (AQA A-Level)
Related terms
Using Light year in the exam
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