Question

The half-life of Radium-226 is 1590 years. If a sample contains 300 mg, how many mg will remain after 4000 years? ...?

Answer 1

The half-life equation is written as:

An = Aoe^-kt

We use this equation for the solution. We do as follows:

0.5 = e^-k(1590)
k = 0.00044

An = 300oe^-0.0004(4000)
An = 52.46 mg will remain after 4000 years

Hope this answers the question. Have a nice day.