You have a 5 mol pure sample of an unknown material. After 4.5 h, you discover that 9% has decayed. Determine the half-life, decay constant, mean life, & initial decay rate. Also determine what the decay rate is at 4.5 h.
$T_{1/2} =$
$\lambda =$
$h^{-1}$
$\tau =$
$R_0 =$
decays/h
$R =$
decays/h
Problem B
The decay rate of a radioactive source decreases by 85.5% in 53 h. Determine the half-life, decay constant, & mean life of the source.
$T_{1/2} =$
$\lambda =$
$h^{-1}$
$\tau =$
