Gce Model Questions Vol1 2022 Physics Question 25

Practice objective / multiple choice question 25 from the 2022 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2022 Physics Objective / Multiple Choice Hard Difficulty
Question 25 GCE_MODEL_QUESTIONS_VOL1 • 2022 • PHYSICS • objective

A 2.0 g sample of a radioactive isotope X (atomic mass \(240\ \text{u}\); \(1\ \text{u}=1.6605\times10^{-27}\ \text{kg}\)) decays by \(\alpha\)-emission with a half‑life of \(4.0\ \text{h}\). Each disintegration releases \(5.0\ \text{MeV}\) of energy. (a) Calculate the initial activity of the sample in becquerels (Bq). (b) After \(12\ \text{h}\), what fraction of the original mass remains? (c) Determine the total energy released up to that time in joules.

Answer Options

A. (a) 2.4×10^16 Bq; (b) 1/2 (50 %); (c) 3.5×10^8 J
B. (a) 1.2×10^17 Bq; (b) 1/4 (25 %); (c) 1.8×10^9 J
C. (a) 3.0×10^17 Bq; (b) 1/16 (6.25 %); (c) 5.0×10^9 J
Correct Answer D. (a) 2.4×10^17 Bq; (b) 1/8 (12.5 %); (c) 3.5×10^9 J
Correct Answer
D
Correct Option:
(a) 2.4×10^17 Bq; (b) 1/8 (12.5 %); (c) 3.5×10^9 J

About This Question

This is Gce Model Questions Vol1 2022 Physics Question 25. It is one of the objective questions from the 2022 Gce Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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