Exam-style question
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What is the relationship between the intensity of X-rays and the distance from the source?.
- A.Intensity decreases with the square of the distance
- B.Intensity increases with the square of the distance
- C.Intensity remains constant regardless of 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
The intensity of X-rays follows the inverse square law, meaning that as the distance from the source increases, the intensity decreases proportionally to the square of that distance. This is due to the spreading of the X-ray beam over a larger area.
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