Exam-style question
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CEPHEID DISTANCE LADDER case: Which option best applies the AQA A-Level Physics objective "Explain how aperture affects diffraction-limited resolution." in Advantages of large diameter telescopes using the relevant astronomical observation rather than a generic calculation?.
- A.astro-227-Cepheid-distance-ladder: Use Explain how aperture affects diffraction-limited resolution. in Advantages of large diameter telescopes.
- B.astro-227-Cepheid-distance-ladder: Swap Advantages of large diameter telescopes with a different Telescopes method.
- C.astro-227-Cepheid-distance-ladder: Give a number or label without linking it to the astronomical evidence.
- D.astro-227-Cepheid-distance-ladder: Ignore the observation and use a generic star or telescope statement.
Model answer
What a good answer should say
- The correct option is astro-227-Cepheid-distance-ladder: Use Explain how aperture affects diffraction-limited resolution.
- in Advantages of large diameter telescopes.
Explanation
Why this works
It is correct because the Cepheid distance ladder context supports explain how aperture affects diffraction-limited resolution. The distractors are weaker because they confuse observational evidence, distance scale, spectra, telescope resolution, brightness or cosmological reasoning with a nearby but different astrophysics idea.
Common mistake
No common mistake is linked to this question yet.