Question

The radioactive substance uranium-240 has a half-life of 14 hours. The amount A(t) of a sample of uranium-240 remaining (in grams) after t hours is given by the following exponential function.

A(t)= 2800(1/2)^t/14
How many grams after 13 hours?
How many grams after 60 hours?

Answer 1

A(t)=2800x(1/2) t/14

A(40)=2800x(1/2) 40/13

386