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O-LevelPhysicsNuclear Physics5054/11 · May/June 2021 · Q391 Mark

The count rate from a radioactive source falls from 4000 counts per minute to 500 counts per minute in 72 minutes. What is the half-life of the source?

A8 minutes
B9 minutes
C18 minutes
D24 minutes

✓ Correct answer

D: 24 minutes

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About this question

Topic
Nuclear Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source
O-Level Physics, May/June 2021 Paper 1 Variant 1, question 39.

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