Exam-style question
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Cepheid period: Identify how Cepheid variation helps find distance. This tests Use distance modulus relationships where appropriate. in Absolute magnitude.
- A.Cepheid period answer: The pulsation period gives luminosity, which is compared with apparent brightness.
- B.Cepheid period distractor: The period is the star surface temperature.
- C.Cepheid period misconception: The period directly equals redshift.
- D.Cepheid period off-scope: The period measures telescope aperture.
Model answer
What a good answer should say
- The correct option is Cepheid period answer: The pulsation period gives luminosity, which is compared with apparent brightness.
Explanation
Why this works
It is correct because it applies Absolute magnitude evidence to Use distance modulus relationships where appropriate.. The other options are incorrect because they swap in a different astrophysics measurement, telescope property or cosmology idea.
Common mistake
No common mistake is linked to this question yet.