The decay constant of a radioactive substance is 0.173 year^-1. Therefore, (1) nearly 63% of the radioactive substance will decay in (1/0.173) year (1) nearly 63% of the radioactive substance will decay in (1/0.173) year The decay constant of a radioactive substance is 0.173 year^-1. Therefore October 18, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) , Facebook Messenger WhatsApp Share this:TwitterFacebook Related