Exam-style question
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How does the distance from a star affect its apparent brightness?.
- A.It has no effect on apparent brightness
- B.Apparent brightness increases with distance
- C.Apparent brightness decreases with distance
- D.Apparent brightness is constant regardless of distance
Model answer
What a good answer should say
- Apparent brightness decreases with distance
Explanation
Why this works
As the distance from a star increases, the light spreads out over a larger area, resulting in a decrease in apparent brightness according to the inverse-square law.
Common mistake
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