CAIE A-Level Physics 25.1.4 Distances from Standard Candles
Practise explaining how a standard candle’s known luminosity and measured brightness determine the distance to a galaxy.
- Syllabus
- 2028–2030
- Course
- Physics 9702
- Level
- A2
Exam points
- explain how a known luminosity and measured radiant flux intensity determine a galaxy distance
- calculate galaxy distance using F = L/(4πd²)
25.1.4—The use of standard candles to determine distances to galaxies question 1
[Maximum number: 3]
Explain how a standard candle in a distant galaxy can be used to determine the distance of the galaxy from an observer.
standard candle has known luminosity
B1
radiant flux intensity measured by observer
B1
(distance calculated using) F=L/4πd2
B1
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