A 15-g sample of radioactive iodine decays in such a way that the mass remaining after t days is given by m (t) = 15e^-0.087t, where m (t) is measured in grams. After how many days is there inly 5 g remaining?

Question

Chemistry

Wendy Casey

7 July, 13:30

A 15-g sample of radioactive iodine decays in such a way that the mass remaining after t days is given by m (t) = 15e^-0.087t, where m (t) is measured in grams. After how many days is there inly 5 g remaining?

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Answers (1)

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Reid · Answer 1

Im going to give you the process so that you may find out with calculations what you need to do. It is simple the part that will be yours:

5 = 15e^ (-.087t)

1/3 = e^ (-.087t)

take ln both sides

ln (1/3) = -.087t - 1.1 = -.087t

t = ?

I think you can do the right calculations so that the answer of t is evident for you