Radioactive decay follows first-order kinetic. The mean life and half-life of nuclear decay
Channel: Doubtnut
Date: 12/07/2020

Radioactive decay follows first-order kinetic. The mean life and half-life of nuclear decay process are `tau = 1// lambda` and `t_(1//2) = 0.693//lambda`. Therefore are a number of radioactive elements in nature, their abundance is directly proportional to half life. The amount remaining after `n` half lives of radioactive elements can be calculated using the relation:  `N = N_(0) ((1)/(2))^(n)`   Half life of `.^(60)Co` is 5.3 years, the time taken for 99.9% decay will be