O-LevelPhysicsNuclear Physics5054/11 · May/June 2024 · Q381 Mark

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?

Athick sheet of lead placed between the source and the detector

Bstrong 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

✓ Correct answer

C: the radioactive source moved closer to the detector

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Topic: Nuclear Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2024 Paper 1 Variant 1, question 38.

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