# Calc

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Radioactive radium () has a half-life of 1599 years. What percent of a given amount will remain after years?

• Calc -

• Calc -

Let P be the initial amount
n be the years
A the amount remaining after n years

A = P*(1/2)^(n/1599)
A/P = (1/2)^(n/1599)
so, the % remaining is
100*(1/2)^(n/1599)

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