If the fraction of the atoms of a radioactive material left after 120years is 1/64; what is the half-life of the material? 1/64 by Sunday | Nov 1 | Physics JAMB | 0 comments A. 20 years B. 10 years C. 2 years D. 24 years Correct Answer: Option A – 20 years Users Also Read These:A radioactive substance has a half-life of 3 days.…The bond formed when two electrons that are shared…If 100 atoms of element X contains 70 atoms of 9X…What is the mass of 6.02 x 10^24 atoms of magnesium?…A radioactive substance has a half-life of 20 days…