The amount of a sample remaining after t days is given by the equation P(t)- A
(9) *
the sample and h is the half-life, in days, of the substance. A sample contains 18% of its original amount of Radon-
222. The half-life of Radon-222 is about 3.8 days. Which is the best estimate for the age of the sample?
O 1.5 days
O 2.5 days
O 9.4 days
O 21.1 days
Mark this and return
Save and Exit
where A is the initial amount of
4
Next
Submit