Question

half life of CO58 is 72 days.calculate the average life

Answer 1

average life =half life /0.693
=>average life =72/0.693=103.89days
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Answer 2

$\textrm{Half life} = \tau_{\frac{1}{2}} = 72 \, days = \frac{ln2}{\lambda} \, \textrm{where } \lambda \textrm{ is decay rate constant} \linebreak \textrm{Average Life is given by } \tau = \frac{1}{\lambda} = \frac{\tau_{\frac{1}{2}}}{ln2} = \frac{72}{0.693} = 103.896 \, days$