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A simple radium weighs 1000g. How long will it take to decay to 125g if its half-life is 1620 years.
A simple radium weighs 1000g. How long will it take to decay to 125g if its half-life is 1620 years.
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oobleck
125 is 1/8 of 1000
1/8 = (1/2)^3
so it will take 3 half-lives
1/8 = (1/2)^3
so it will take 3 half-lives