A-level Physics · Stellar luminosity

Stefan's law for a star

Use L = 4πr²σT⁴ to find a star's luminosity, its radius or its surface temperature.

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Question 1

A star has a surface temperature of 10000 K and a radius of 3.5×1093.5 \times 10^{9} m. Assuming that it radiates as a black body, calculate its luminosity. Use σ = 5.67×10−85.67 \times 10^{-8} W m⁻² K⁻⁴. Give your answer to 3 significant figures.

W

You can type 4.53, 3.2e-5, 3.2 × 10^-5 or 7/3.

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