Exam-style question
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What is the relationship between the intensity of gamma radiation and the distance from the source according to the inverse-square law?.
- A.Intensity is directly proportional to the distance squared.
- B.Intensity is inversely proportional to the distance squared.
- C.Intensity remains constant regardless of distance.
- D.Intensity is inversely proportional to the distance.
Model answer
What a good answer should say
- Intensity is inversely proportional to the distance squared.
Explanation
Why this works
According to the inverse-square law, the intensity (I) of radiation is inversely proportional to the square of the distance (d) from the source, expressed as I ∝ 1/d². This means that as the distance increases, the intensity decreases significantly.
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