Exam-style question
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How does the apparent magnitude of a star differ from its absolute magnitude?.
- A.Apparent magnitude is affected by distance, while absolute magnitude is not.
- B.Absolute magnitude is always greater than apparent magnitude.
- C.Both magnitudes measure the same property of a star.
- D.Apparent magnitude is measured in parsecs.
Model answer
What a good answer should say
- Apparent magnitude is affected by distance, while absolute magnitude is not.
Explanation
Why this works
The evidence indicates that apparent magnitude measures how bright a star appears from Earth, which can change with distance. In contrast, absolute magnitude reflects the star's true brightness at a standard distance of 10 parsecs.
This implies that apparent magnitude can vary based on the observer's location, while absolute magnitude remains constant. Thus, the conclusion is that the two magnitudes represent different aspects of a star's brightness.
Common mistake
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