1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution hello..im new to nuclear physics and i have problems attempting helf life questions.. hope you can help me with this question.. The half-life of a given radioactive isotope is 10 years. What is the mass of this isotope remaining undecayed after 20 years if the original mass was 12g? thank you..