The decay of uranium is modelled by

Question

D = D_0 * 2^(-kt). If it takes 6 years for the mass of uranium to halve, find the percentage remaining after:
a. 2 years

Answer 1

Since the half-life is 6 years,

D = D_0 * 2^(-t/6)

So, just plug in your numbers and find that

D/D_0 = 2^(-2/6) = 0.7937 ≈ 79%

Answer 2

Alright, thanks