Which Statement Regarding the Activity of a Radioactive Sample Is

Multiple Choice

Which statement regarding the activity of a radioactive sample is NOT correct?

A) The activity of a sample is the number of decay events per second.
B) The activity depends on a rate constant for the decay and the amount of the radioisotope in the sample.
C) Radioactive decay follows first-order reaction kinetics.
D) The activity will decrease to half its initial value in a time equal to lN₂) / k, where k is the rate constant.
E) All of these are correct.