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

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?
  • A.
    20
  • B.
    25
  • C.
    50
  • D.
    200
  • E.
    400
Correct Answer: Option C
Explanation