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A radioactive substance decays exponentially with a half life of 500 years. After 1,500 years, what percent of the radioactive material remains?

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wolf1728
There are fancy formulas for this but this calculation is easy.
1,500 years exactly equals 3 half-lives.  After 1 half-life you have 50%, after 2 half-lives, you have 25% and after 3 half-lives 12.5 per cent remains.

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