O-LevelPhysicsNuclear Physics5054/11 · Oct/Nov 2016 · Q391 Mark

A freshly made sample of radioactive material gives a count rate of 8000 counts per minute. After 20 days, it gives a count rate of 500 counts per minute. What is the half-life of the material?

A4.0 days

B5.0 days

C20 days

D80 days

✓ Correct answer

B: 5.0 days

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Topic: Nuclear Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2016 Paper 1 Variant 1, question 39.

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