Physics · A-Level · AQA · AQA A-level Physics (7408) · Specification point · 3.9.2.1 · Astrophysics (A-level only) · Classification of stars (A-level only)
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3.9.2.1 Classification by luminosity (A-level only)
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Apparent magnitude, m. The Hipparcos scale. Dimmest visible stars have a magnitude of 6. Relation between brightness and apparent magnitude. Difference of 1 on magnitude scale is equal to an intensity ratio of 2.51. Brightness is a subjective scale of measurement. |