Question

A radioactive sample has initial concentration $N_0$ of nuclei :

• A. The number of undecayed nuclei present in the sample decays exponentially with time
• B. The activity (R) of the sample at any instant is directly proportional to the number of undecayed nuclei present in the sample at that time
• C. The number of decayed nuclei grows linearly with time
• D. The number of decayed nuclei grows exponentially with time

Answer 1

Answer: (A), (B), (D)

According to the decay equation we have $N=N_{0} e^{-\lambda t}$ hence option (A) and (D) are correct and according to radioactive decay law option (B) is correct.