Gce Model Questions Vol1 2018 Physics Question 28
Practice objective / multiple choice question 28 from the 2018 Gce Model Questions Vol1 Physics examination.
A radioactive isotope \(X\) decays to \(Y\) by \(\beta\)-decay with half-life \(T_{1}=30\ \text{min}\). The daughter \(Y\) subsequently decays to a stable nucleus \(Z\) by \(\alpha\)-decay with half-life \(T_{2}=10\ \text{min}\). Initially the sample contains \(N_0 = 1.0\times10^{20}\) atoms of \(X\) and no atoms of \(Y\). Each \(\beta\) decay releases \(0.5\ \text{MeV}\) and each \(\alpha\) decay releases \(5\ \text{MeV}\). After a time of \(t = 1.0\ \text{h}\): (a) how many atoms of \(Y\) are present? (b) what is the activity of \(Y\) (in becquerels)? (c) what total energy (in joules) has been released by all decays up to that time?
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About This Question
This is Gce Model Questions Vol1 2018 Physics Question 28. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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