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Cambridge IGCSE. 2025. Physics (0625). May/June - Paper 2 (22) · Multiple Choice (Extended) - Question 37

Cambridge IGCSE · Paper 2 (22) · Multiple Choice (Extended)

Question 37

A sample of a radioactive material has a half-life of 20 minutes.

Which statement is correct?
  1. After 30 minutes, less than half of the material has decayed.
  2. After 40 minutes, all of the radioactive material has decayed.
  3. After 60 minutes, an eighth of the radioactive material remains.
  4. After 120 minutes, a sixth of the radioactive material remains.
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