Year 13 Physics
Astrophysics and cosmology
Stars and their luminosity, the Hertzsprung-Russell diagram and stellar evolution, Wien and Stefan laws, standard candles, redshift, the Hubble law and the Big Bang.
Astrophysics and cosmology free practice
No timer and no account needed. Check each answer as you go, then read the explanation.
1. Take the intensity of sunlight at Earth to be 1360 W m⁻². How many watts of solar power fall on a 2.0 m² panel facing the Sun directly?
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