Physics

Problem

For two different radioactive nuclides, straight-line graphs of

\ln A

versus

t

give slopes

-0.035\,\text{day}^{-1}

and

-0.021\,\text{day}^{-1}

respectively. (i) Which nuclide has the longer half-life? (ii) By what factor is its half-life greater than that of the other?