Question

What is the half life of a radioactive isotope if a 500 gram sample decays to 62.5 grams in 99 years?

Answer 1

24.75 years

Step-by-step explanation:

62.5 is 1/4 of 500, which means that in 99 years it passed through four half-lifes. So, you divide 99 by four and you get that the half-life is 24.75 years. 25 years if it was rounded