BRAINCAKEStefan's Law
Stefan's law gives the total power emitted (the luminosity) by a black body:
P = σAT4
where P is power in W, A is the surface area in m2, T is the surface temperature in K and σ is the Stefan constant, 5.67 × 10-8 W m-2 K-4. For a spherical star of radius r, A = 4πr2.
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Key terms in this lesson
- inverse square law
- A relationship in which a quantity, such as field strength or intensity, is proportional to one over the square of the distance from its source.
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- The Hertzsprung-Russell Diagram
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- Supernovae, Neutron Stars and Black Holes
All 24 lessons in Astrophysics · All AQA A-level Physics topics