The halflife of radioactive uranium II234U is 250 000 years

The half-life of radioactive uranium II(^234U) is 250, 000 years. What percent of the present amount of radioactive uranium II will remain after 5, 000 years?

Solution

Half life = t_1/2 = 250000 years

t = 5000 years

Now N(t) = No*e^(-t*ln2/t_1/2) = No*e^(-5000*ln2/250000)

N(t)/No = 0.98623

N(t)/No = 98.62%