If 80% of a radioactive element undergoing decay is left over after a certain period of time from the start, how many such periods should elapse from the start for just over 50% of the element to be left over? |
If 80% of a radioactive element undergoing decay is left over after a certain period of time from the start, how many such periods should elapse from the start for just over 50% of the element to be left over? |
(3) Let (Amount left) Amount left [ number of half lives] Alternatively |