question_answer

Given that a radioactive species decays according to exponential law \[N={{N}_{0}}{{e}^{-\lambda t}}\]. The half-life of the species is [Kerala (Med.) 2003]

A)                 \[\lambda \]      

B)                 \[No\]

C)                 \[\lambda /\ln 2\]           

D)                 \[\ln 2/\lambda \]