Question 1
If 12% of a certain radioisotope decays in 5.2 years, what is the half-life of this isotope?
◦ 0.59 yr
◦ 1.7 yr
◦ 22 yr
◦ 28 yr
◦ 32 yr
Question 2
If 24% of a certain radioisotope decays in 6.5 years, what is the half-life of this isotope?
◦ 3.9 yr
◦ 16 yr
◦ 0.22 yr
◦ 2.2 yr
◦ 3.2 yr