Question

How much of radioactive kind of iodine will be left after 180 days if you start with 960 grams and half-life is 60 days

Answer 1

The formula for half-life is
`A=A_02^{ (-t)/(T_(1/2))`.
`A_0 = 960`,
`t_(1/2) = 60`,
`t=180`.
`A = 120`. This answer is reasonable because it smaller than the starting value, and it accounts for having it three times basically.

120 grams