SOLUTION: Radioactive radium has a half-life of 1580 years. A) (3 pts) Find the rate (constant) of decay. B) (4 pts) How long will it take for 80% of a quantity of radioactiv

Question 729995: Radioactive radium has a half-life of 1580 years.
A) (3 pts) Find the rate (constant) of decay.
B) (4 pts) How long will it take for 80% of a quantity of radioactive radium to decay (to a level of 20% of the original amount)?

Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
Let A = amount
let I = initial amount
let t = time in years
General decay eqaution,

Starting at any I, half life of 1580 years makes ,

Find k.
...
.
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