Neco 2021 Physics Question 37
Practice objective / multiple choice question 37 from the 2021 Neco Physics examination.
A radioactive isotope \(A\) decays to isotope \(B\) with a half‑life of \(30\) minutes. Isotope \(B\) itself is radioactive and decays to a stable nucleus \(C\) with a half‑life of \(10\) minutes. Initially only \(A\) is present, with an unknown number of atoms \(N_{0}\). After \(40\) minutes the activity of \(B\) is measured to be \(2.0\times10^{4}\) becquerels. Determine the initial number of atoms \(N_{0}\) (give your answer to two significant figures).
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About This Question
This is Neco 2021 Physics Question 37. It is one of the objective questions from the 2021 Neco Physics examination.
Difficulty level: Hard .
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