A radioactive element has half-life period 800 yr. After 6400 yr, what amount will remain ? A radioactive element has half-life period 800 yr. After 6400 yr what amount will remain ? August 16, 2020 Category: Chapter 31 - Nuclei , NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions , Physics , Facebook Messenger WhatsApp Share this:TwitterFacebook Related