The count rate of an alpha-particle source is 400 per minute. If the half-life of…

Physics WAEC 1996

The count rate of an alpha-particle source is 400 per minute. If the half-life of the source is 5 days, what would be the count rate per minute after 15 days?

  • 20
  • 25
  • 50 checkmark
  • 200
  • 400

The correct answer is: C

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