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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?

  • earth space science -

    Since (1/2)^4 = 1/16, that would require 4 half-lives, which is 5 billion years.

  • earth space science -

    5 billion

  • earth space science -

    5bil

  • earth space science -

    2.5 billion

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