Question

Strontium is a radioactive material that decays with a continuous rate (k) of -0.0244. If there are 30 grams of strontium present today and it decays continuously, how much will be present in 20 years?

Answer 1

18.42 g

Explanation:

Using the exponential growth / Decay function :

A = Pe^kt

A = final amount ; P = initial amount, t = number of years ; t = 20

A = 30e^-(0.0244 * 20)

A = 30e^-0.488

A = 30 * 0.6138528

A = 18.415586

Strontium present after 20 years will be :

18.42 g