Gce Model Questions Vol1 2023 Physics Question 17

Practice objective / multiple choice question 17 from the 2023 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2023 Physics Objective / Multiple Choice Hard Difficulty
Question 17 GCE_MODEL_QUESTIONS_VOL1 • 2023 • PHYSICS • objective

A sealed sample contains two radioactive isotopes, A and B, that both decay by \(\beta\) emission. Isotope A has a half‑life of \(30\) min and an initial activity of \(800\) Bq. Isotope B has a half‑life of \(2\) h and an unknown initial activity. After exactly \(1\) h the total measured activity of the sample is \(900\) Bq.\n\n(a) Determine the initial activity of isotope B.\n(b) If each decay of A releases \(0.5\) MeV and each decay of B releases \(1.2\) MeV, calculate the total energy released by the sample during the first hour. Give your answer in joules (J) in scientific notation to two significant figures.

Answer Options

A. Initial activity of B ≈ 1.1×10^{3} Bq; total energy released ≈ 7.5×10⁻⁷ J
B. Initial activity of B ≈ 8.5×10^{2} Bq; total energy released ≈ 6.2×10⁻⁷ J
Correct Answer C. Initial activity of B ≈ 9.9×10^2 Bq; total energy released ≈ 7.0×10⁻⁷ J
D. Initial activity of B ≈ 9.0×10^{2} Bq; total energy released ≈ 8.0×10⁻⁷ J
Correct Answer
C
Correct Option:
Initial activity of B ≈ 9.9×10^2 Bq; total energy released ≈ 7.0×10⁻⁷ J

About This Question

This is Gce Model Questions Vol1 2023 Physics Question 17. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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