Question

If you started with 1000 units of a radioactive element that has a half-life of 2,500 years, how many half-lives will the material have gone through in 7500 years? (Show work and explain answer).

Answer 1

either 1 because half the atoms can only decay once or 3 divide 7500 years by the amount of time it takes to reach a half life

Answer 2

well 1000×3=7500 so it would of gone through 3 half-lives