Question

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

Answer 1

radio active radium(226)

Answer 2

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)