Physics

Problem

What is the correct expression for the decay constant

\lambda

in terms of the half-life

t_{1/2}

of a radioactive isotope? a)

\displaystyle \lambda = \frac{1}{t_{1/2}}

\displaystyle \lambda = \frac{2}{t_{1/2}}

\displaystyle \lambda = \frac{\ln 2}{t_{1/2}}

\displaystyle \lambda = \frac{1}{t_{1/2}\,\ln 2}