Exam-style question
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What is the relationship between luminosity and distance for stars according to the inverse-square law?.
- A.Luminosity increases with distance.
- B.Luminosity decreases with distance squared.
- C.Luminosity is independent of distance.
- D.Luminosity is directly proportional to distance.
Model answer
What a good answer should say
- Luminosity decreases with distance squared.
Explanation
Why this works
According to the inverse-square law, as the distance from a star increases, the apparent brightness decreases with the square of that distance, indicating that luminosity appears less bright at greater distances.
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