Edexcel A-Level Physics Stefan-Boltzmann Law

Review the Stefan-Boltzmann law in Edexcel A-Level Physics through luminosity, surface-area, temperature and stellar-radius calculations.

Exam points

calculate luminosity or power using L = σAT⁴ with surface area and temperature data
find stellar radius from luminosity and temperature using A = 4πr² in black body models
evaluate website claims by comparing calculated luminosity or radius ratios with stated values

[Maximum number: 2]

The Sun is a main sequence star.

The Sun will eventually leave the main sequence and become a red giant star.
luminosity of Sun = 3.83 × 10^26 W

Show that the current radius of the Sun is about 7.0 × 10^8 m.
surface temperature of Sun = 5780 K

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