Number of nuclei of a radioactive substance at time t = 0 are 1000 and 900 at time t = 2s. What will be the number of nuclei at time t = 4s? Number of nuclei of a radioactive substance at time t = 0 are 1000 and 900 at time t = 2s. What will be the number of nuclei at time t = 4s? September 4, 2021 Category: Arihant Physics by D.C Pandey , Facebook Messenger WhatsApp Share this:TwitterFacebook Related