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
waec 1990physics

The correct answer is B. 1/16

1 → 1/2 → 1/4 → 1/8 → 1/16

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