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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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∙ 7y ago
1.25 billion years
Orion Wisoky
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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?
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.
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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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