Neco 2024 Physics Question 35

Practice objective / multiple choice question 35 from the 2024 Neco Physics examination.

Neco 2024 Physics Objective / Multiple Choice Hard Difficulty
Question 35 NECO • 2024 • PHYSICS • objective

A sample initially contains \(2.0\times10^{6}\) atoms of a radionuclide that decays by beta emission with a half‑life of \(30\) minutes to a daughter nuclide. The daughter itself decays by gamma emission with a half‑life of \(10\) minutes, releasing a \(0.5\,\text{MeV}\) photon each decay. Calculate (a) the total activity of the sample (parent plus daughter) after \(45\) minutes and (b) the total energy released per second at that instant. Use \(\ln 2 = 0.693\) and \(1\,\text{eV}=1.602\times10^{-19}\,\text{J}\).

Answer Options

Correct Answer A. Total activity \(\approx 5.4\times10^{2}\,\text{Bq}\); Power \(\approx 2.2\times10^{-11}\,\text{J s}^{-1}\)
B. Total activity \\(\\approx 5.0\\times10^{2}\\,\\text{Bq}\\); Power \\(\\approx 2.2\\times10^{-10}\\,\\text{J s}^{-1}\\)
C. Total activity \\(\\approx 4.8\\times10^{2}\\,\\text{Bq}\\); Power \\(\\approx 1.9\\times10^{-11}\\,\\text{J s}^{-1}\\)
D. Total activity \\(\\approx 6.1\\times10^{2}\\,\\text{Bq}\\); Power \\(\\approx 2.5\\times10^{-11}\\,\\text{J s}^{-1}\\)
Correct Answer
A
Correct Option:
Total activity \(\approx 5.4\times10^{2}\,\text{Bq}\); Power \(\approx 2.2\times10^{-11}\,\text{J s}^{-1}\)

About This Question

This is Neco 2024 Physics Question 35. It is one of the objective questions from the 2024 Neco Physics examination.

Difficulty level: Hard .

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