Half-life of a radioactive substance A is 4 days. The probability that a nucleus will decay in two half-lives is Half-life of a radioactive substance A is 4 days. The probability that a nucleus will decay in two half-lives is September 15, 2021 Category: Chapter 18 - Atoms and Nuclei , JEE Mains Physics 2002-2019 Solved Video Solutions , Facebook Messenger WhatsApp Share this:TwitterFacebook Related