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# The rate constant for a first order reaction is $20hr^{-1}$.The half life of the reaction will be

$\begin{array}{1 1}(a)\;20hrs&(b)\;1/20hrs\\(c)\;ln\; 2/20min&(d)\;ln \;2/20hrs\end{array}$

$t_{1/2}=\large\frac{ln\; 2}{k}=\frac{ln\; 2}{20}$hrs
Hence (d) is the correct answer.