Neco Model Questions Vol1 2019 Physics Question 27

Practice objective / multiple choice question 27 from the 2019 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2019 Physics Objective / Multiple Choice Hard Difficulty
Question 27 NECO_MODEL_QUESTIONS_VOL1 • 2019 • PHYSICS • objective

A 2.0 g sample of a radioactive isotope X (atomic mass 240 u) decays by \(\alpha\)-emission to a stable daughter Y. The half-life of X is 5.0 years and each decay releases 5.0 MeV of energy. (a) Calculate the initial activity of the sample in becquerels (Bq). (b) After 15 years, how much total energy (in joules) has been released by the decays that have occurred?

Answer Options

A. Initial activity \(\approx 3.3\times10^{13}\) Bq; Energy released \(\approx 5.2\times10^{9}\) J
B. Initial activity \(\approx 1.1\times10^{13}\) Bq; Energy released \(\approx 1.8\times10^{9}\) J
C. Initial activity \(\approx 2.2\times10^{12}\) Bq; Energy released \(\approx 3.5\times10^{8}\) J
Correct Answer D. Initial activity \(\approx 2.2\times10^{13}\) Bq; Energy released \(\approx 3.5\times10^{9}\) J
Correct Answer
D
Correct Option:
Initial activity \(\approx 2.2\times10^{13}\) Bq; Energy released \(\approx 3.5\times10^{9}\) J

About This Question

This is Neco Model Questions Vol1 2019 Physics Question 27. It is one of the objective questions from the 2019 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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