Exam-style question
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How does apparent brightness differ from luminosity in stars?.
- A.Apparent brightness is the actual power output of a star.
- B.Luminosity is the brightness observed from Earth.
- C.Apparent brightness depends on distance, while luminosity is intrinsic.
- D.Both terms refer to the same concept.
Model answer
What a good answer should say
- Apparent brightness depends on distance, while luminosity is intrinsic.
Explanation
Why this works
The evidence indicates that apparent brightness varies with distance from the observer, while luminosity is a measure of the total energy output of a star. This implies that two stars can have the same luminosity but appear differently bright depending on their distance.
Thus, we conclude that understanding both concepts is crucial for interpreting stellar data.
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