Question

A radioactive sample contains 1.60 g of an isotope with a half-life of 3.9 days. part a what mass of the isotope will remain after 5.6 days? (assume no excretion of the nuclide from the body.)

Answer 1

Answer:

.59 g

Explanation:

5.6 d / 3.9 d /half life = 1.436 half lives

(1/2)^1.436 = .3696 of original left

.3696 * 1.6 = .59 gm