Physics · May / June 2024 · Paper 11 · Question 38
5054Detection of radioactivity
A radioactive source emitting only gamma radiation is placed in front of a radiation detector which measures the count rate. What must cause the count rate to increase?
- Aa thick sheet of lead placed between the source and the detector
- Ba strong magnetic field placed between the source and the detector
- Cthe radioactive source moved closer to the detector
- Dthe detector moved further away from the radioactive source
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Correct answer: C. the radioactive source moved closer to the detector
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