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CAIE A-Level Physics A2 25.1 Standard Candles Questions

Practise calculating luminosity and radiant flux, applying the inverse-square relationship and using standard-candle observations to determine astronomical distance.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • define and calculate stellar luminosity and radiant flux intensity
  • use the inverse-square relationship F = L/(4?d?) to determine luminosity, flux or distance
  • define a standard candle and use its known luminosity with measured flux
  • determine the distance of a galaxy from standard-candle observations

Covered syllabus points

25.1.1—The term luminosity as the total power of radiation emitted by a star25.1.2—The inverse square law for radiant flux intensity F25.1.3—An object of known luminosity is called a standard candle25.1.4—The use of standard candles to determine distances to galaxies

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