Gce Model Questions Vol1 2017 Physics Question 9
Practice objective / multiple choice question 9 from the 2017 Gce Model Questions Vol1 Physics examination.
A \(1.00\,\text{g}\) sample of the radioactive isotope \(^{238}\text{U}\) (half‑life \(T_{A}=4.5\times10^{9}\,\text{yr}\)) decays to \(^{234}\text{Th}\), which in turn decays to a stable nuclide with half‑life \(T_{B}=1.0\times10^{5}\,\text{yr}\). Initially the sample contains only \(^{238}\text{U}\). After a period of \(2.0\times10^{5}\,\text{yr}\):\n\n(i) What is the activity of the daughter nuclide \(^{234}\text{Th}\) (in becquerels, to two significant figures)?\n\n(ii) What fraction of the original \(^{238}\text{U}\) atoms have decayed by that time? Express your answer in scientific notation to two significant figures.
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This is Gce Model Questions Vol1 2017 Physics Question 9. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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