Asked by Potassium-40 has a half-life of approximately 1.25

Potassium-40 has a half-life of approximately 1.25 billion years. Approximately how many years will pass before a sample of potassium-40 contains one-sixteenth the original amount of parent isotope?
Answered by drwls
Since (1/2)^4 = 1/16, that would require 4 half-lives, which is 5 billion years.
Answered by Shayla
5 billion
Answered by kp
5bil
Answered by Sue
2.5 billion
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