Question

Argon-41 is used to measure the rate of gas flow. The decay constant is 6.3*10^-3 min^-1. What is its half life and how long before only 1.00% is left?

Answer 1

\[t _{1/2}=\frac{ \ln2 }{ k }\]

k is the decay constant

Answer 2

\[A=A _{0}e ^{-kt}\]

Ao =initial amount
A =amount at given time
k =decay/growth constant
t = time