question_answer

During the nuclear explosion, one of the products is \[^{90}Sr\] with half life of 6.93 years. If \[1\,\,\mu g\] of  \[^{90}Sr\]was absorbed in the bones of a  newly born baby in place of Ca, how much time, in years, is required to reduce it by 90% if it is not lost metabolically _________.                                                      [JEE MAIN Held on 07-01-2020 Morning]

Answer:

23.03