Radium decays according to the function Q(t) = Q0e-kt where Q represents the quantity remaining after t years and k is the decay constant 0.00043. What is the half-life of radium? Calculate how long it will take for 120g of radium to decay to 60g. Round your answer to the nearest year.
60=120e^(-0.00043t) solve for t divide both sides by 120 1/2=e^(-0.00043t) take ln of both sides ln(1/2)=-0.00043t divide both sides by -0.00043 ln(1/2)/-0.00043=t tâ1611.97 years about 1612 years
