Gce Model Questions Vol1 2021 Physics Question 49
Practice objective / multiple choice question 49 from the 2021 Gce Model Questions Vol1 Physics examination.
A mixed sample contains two radioactive isotopes, X and Y. Isotope X has a half‑life of \(30\ \text{min}\) and decays by \(\alpha\) emission; isotope Y has a half‑life of \(2\ \text{h}\) and decays by \(\beta\) emission. Initially the sample contains \(N_{X0}\) atoms of X and \(N_{Y0}\) atoms of Y. After exactly \(1\ \text{h}\) the total activity measured is \(3.0\times10^{6}\ \text{Bq}\) and the activity of X is twice that of Y at that time. Determine the initial number of atoms of isotope X, \(N_{X0}\), expressed in scientific notation to two significant figures.
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This is Gce Model Questions Vol1 2021 Physics Question 49. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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