SOLVED: 4) Half-life of an element is the time required for half of a given sample of radioactive element to change to another element The rate of change of concentration is calculated
Half Life: The Decay of Knowledge and What to Do About It
5 Ways to Calculate Half Life - wikiHow
A certain radioactive material has a half life of 20 days. How long will take for 3/4 of the atoms originally present to disintegrate? - Quora