Exam-style question
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What is the effect of doubling the distance from a gamma radiation source on the intensity of the radiation?.
- A.It doubles the intensity.
- B.It quadruples the intensity.
- C.It halves the intensity.
- D.It reduces the intensity to a quarter.
Model answer
What a good answer should say
- It reduces the intensity to a quarter.
Explanation
Why this works
Doubling the distance from a gamma radiation source results in a decrease in intensity by a factor of four, according to the inverse-square law. This means that the intensity is reduced to a quarter of its original value.
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