Neco 2019 Physics Question 33

Practice objective / multiple choice question 33 from the 2019 Neco Physics examination.

Neco 2019 Physics Objective / Multiple Choice Hard Difficulty

Question 33 NECO • 2019 • PHYSICS • objective

A \(2.0\ \text{g}\) sample of the radioactive isotope \(\mathrm{^{226}Ra}\) (half‑life \(30\ \text{years}\)) decays by emitting an \(\alpha\) particle that releases \(5.0\ \text{MeV}\) of energy per decay. (a) Calculate the initial activity of the sample in becquerels (Bq). (b) After \(90\ \text{years}\), how much total energy (in joules) has been released by the decays that have occurred? Give your answer in scientific notation with two significant figures.

A. 4.2×10^12 Bq; 3.7×10^9 J

Correct Answer B. 3.9×10^12 Bq; 3.7×10^9 J

C. 4.5×10^12 Bq; 4.5×10^9 J

D. 3.9×10^12 Bq; 4.1×10^9 J

Correct Answer

Correct Option:

3.9×10^12 Bq; 3.7×10^9 J

This is Neco 2019 Physics Question 33. It is one of the objective questions from the 2019 Neco Physics examination.

Difficulty level: Hard .

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