Neco 2023 Physics Question 2

Practice objective / multiple choice question 2 from the 2023 Neco Physics examination.

Neco 2023 Physics Objective / Multiple Choice Hard Difficulty
Question 2 NECO • 2023 • PHYSICS • objective

A \(2.0\ \text{g}\) sample of a radionuclide X (atomic mass \(120\ \text{g\,mol}^{-1}\)) decays by \(\beta\)-emission to Y with a half-life of \(8.0\ \text{h}\). The daughter nuclide Y subsequently decays by \(\alpha\)-emission to a stable nuclide Z with a half-life of \(2.0\ \text{h}\). Initially only X is present. (a) Determine the time after which the activity of Y reaches its maximum. (b) Calculate that maximum activity in becquerels (Bq). Use \(N_{A}=6.022\times10^{23}\ \text{mol}^{-1}\).

Answer Options

A. t \approx 4.00 h; A_{max} \approx 1.2\times10^{17}\ \text{Bq}
B. t \approx 6.50 h; A_{max} \approx 1.8\times10^{17}\ \text{Bq}
Correct Answer C. t \approx 5.33 h; A_{max} \approx 1.5\times10^{17}\ \text{Bq}
D. t \approx 5.33 h; A_{max} \approx 1.0\times10^{17}\ \text{Bq}
Correct Answer
C
Correct Option:
t \approx 5.33 h; A_{max} \approx 1.5\times10^{17}\ \text{Bq}

About This Question

This is Neco 2023 Physics Question 2. It is one of the objective questions from the 2023 Neco Physics examination.

Difficulty level: Hard .

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