# The relation between $\lambda$ and $T_\frac{1}{2}$ is : ( $T_\frac{1}{2}$= half life , $\lambda\rightarrow decay constant$ )
( A ) $T_{1/2}=\frac{ln2}{\lambda}$
( B ) $(\lambda+T_{1/2})=\large\frac{ln}{2}$
( C ) $T_{1/2} ln2=\lambda$
( D ) $T_{1/2} =\frac{1}{\lambda}$