Question

The half-life of Radium-223 is 11.43 years. What is the annual decay rate? Express the result to four decimal places.

Answer 1

Answer:

Below

Step-by-step explanation:

e^(-kt) = 1/2     when t = 11.43

so  k = .060642797

e^ (- .060642797 * 1) = .9411  <====   is left after one year

             which means the decay in one year is

                  1 - .9411 = .05884 = 5.88% per year