Exam-style question
Try this first
Which of the following statements correctly describes the relationship between gamma radiation intensity and distance?.
- A.Intensity increases as distance increases.
- B.Intensity decreases with the square of the distance.
- C.Intensity is unaffected by distance.
- D.Intensity decreases linearly with distance.
Model answer
What a good answer should say
- Intensity decreases with the square of the distance.
Explanation
Why this works
According to the inverse-square law, the intensity of gamma radiation decreases as the square of the distance from the source increases. This means that if you double the distance, the intensity becomes one-fourth.
Common mistake
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