A-LevelPhysicsPhysical quantities and units9702/12 · May/June 2016 · Q21 Mark

The luminosity L of a star is given by L = 4πr² σΤ⁴ where r is the radius of the star, T is the temperature of the star, σ is a constant with units Wm⁻²K⁻⁴. What are the SI base units of L?

Akgm²s⁻¹

Bkgm²s⁻²

Ckgm²s⁻³

Dkg m²s⁴

✓ Correct answer

C: kgm²s⁻³

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Topic: Physical quantities and units, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2016 Paper 1 Variant 2, question 2.

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