Question

The half-life of a radioactive material is $693$ years. Find its decay constant.

Answer 1

here,

$T_{1/2}=693$

Half life of a radioactive material is given by,

$T_{1/2}=\frac{ln2}{\lambda }$

where $\lambda$ is decay constant.

$\therefore \lambda =\frac{ln2}{T_{1/2}}$

$\therefore \lambda =\frac{ln2}{693}$

$\therefore \lambda =0.001$per year