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A particular isotope has a half-life of 1000 years. If you start with 1 kilogram of this isotope, how much will remain after 400 years?

A particular isotope has a half-life of 1000 years. If you start with 1 kilogram of this isotope, how much will remain after 400 years? After 4000 years? E The remaining amount after 400 years will be El kilogram(s). (Round to three decimal places as needed.)

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