Exam-style question
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STELLAR SPECTRUM case: Which option best applies the AQA A-Level Physics objective "Explain how redshift supports an expanding Universe." in Hubble's law using the relevant astronomical observation rather than a generic calculation?.
- A.astro-202-stellar-spectrum: Use Explain how redshift supports an expanding Universe. in Hubble's law.
- B.astro-202-stellar-spectrum: Swap Hubble's law with a different Cosmology method.
- C.astro-202-stellar-spectrum: Give a number or label without linking it to the astronomical evidence.
- D.astro-202-stellar-spectrum: Ignore the observation and use a generic star or telescope statement.
Model answer
What a good answer should say
- The correct option is astro-202-stellar-spectrum: Use Explain how redshift supports an expanding Universe.
- in Hubble's law.
Explanation
Why this works
It is correct because the stellar spectrum context supports explain how redshift supports an expanding Universe. 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.