Chemistry

Problem

Which one of the following correctly gives the relation between the half-life

T_{1/2}

of a radioactive substance and its decay constant

\lambda

? a)

T_{1/2}=\dfrac{\lambda}{\ln 2}

T_{1/2}=\dfrac{1}{\lambda\,\ln 2}

T_{1/2}=\dfrac{\ln 2}{\lambda}

T_{1/2}=\lambda\,\ln 2