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A radioactive substance has a half-life of 20 hours. What fraction of the original radioactive...

Physics
WAEC 1990
A radioactive substance has a half-life of 20 hours. What fraction of the original radioactive nuclei will remain after 80 hours?
  • A. 1/32
  • B. 1/16
  • C. 1/8
  • D. 1/4
  • E. 1/2
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Correct Answer: Option B
Explanation
1 → 1/2 → 1/4 → 1/8 → 1/16
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