Question

You have 192 grams of a radioactive kind of iodine. How much will be left
after 28 hours if its half-life is 7 hours?

Answer 1

Answer:

192/2= 96 g after 7h

96/2=48 g after 14h

48/2= 24 g after 21h

24/2= 12 g after 28h