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CAIE A-Level Physics A2 25.2 Stellar Radii Questions

Practise using Wien’s law and the Stefan-Boltzmann law to find stellar temperature, luminosity or radius and combine them for stellar estimates.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • use Wien?s displacement law to infer stellar surface temperature from peak wavelength
  • use the Stefan?Boltzmann law to calculate stellar luminosity, radius or temperature
  • combine Wien?s law and the Stefan?Boltzmann law to estimate stellar radius

Covered syllabus points

25.2.1—Wien’s displacement law λmax ∝ 1 / T to estimate the peak surface25.2.2—The Stefan–Boltzmann law L = 4 πσr 2 T 425.2.3—Wien’s displacement law and the Stefan–Boltzmann law to estimate the radius

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