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1.25 billion years

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Q: A potassium-40 sample starts with 50 atoms and 1.25 billion years later there are 25 atoms. What is the half-life of potassium-40?

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700 milliion years. The definition of half-life is the period of time during which one-half of the atoms of an element undergo decay into other elements.

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The half-life of potassium 40 is 1.25 billion years. This is because the number of atoms decreased by half (from 50 to 25) in this time period, indicating one half-life has passed.

There will be 125 atoms of Na24 remaining in the sample after 45 hours. This calculation is based on the fact that after 3 half-lives (45 hours/15 hours per half-life), the original 1000 atoms would have reduced by a factor of 2 three times, resulting in 1000/2/2/2 = 125 atoms remaining.

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Something that is a billion starts with base 109. Therefore, the term in scientific notation is 7.0 x109

Ir starts at circa 5 billion dollars

John Elway