O-LevelPhysicsNuclear Physics5054/11 · May/June 2016 · Q391 Mark

A sample of a radioactive isotope produces a count rate of 10000 counts per minute. The half-life of the isotope is one day. What was the count rate of the sample two days ago?

A2500 counts per minute

B5000 counts per minute

C20000 counts per minute

D40000 counts per minute

✓ Correct answer

D: 40000 counts per minute

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

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