Neco 2021 Physics Question 7
Practice objective / multiple choice question 7 from the 2021 Neco Physics examination.
An isolated sample initially contains \( N_{0}=1.0\times10^{20} \) atoms of a radioactive isotope A. Isotope A decays to isotope B by beta emission with a half‑life of \( 10\ \text{min} \); isotope B subsequently decays to a stable nucleus C by alpha emission with a half‑life of \( 5\ \text{min} \). Each decay of A releases \( 2.0\ \text{MeV} \) and each decay of B releases \( 1.5\ \text{MeV} \). Calculate the total energy released (in joules) after \( 30\ \text{min} \).
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About This Question
This is Neco 2021 Physics Question 7. It is one of the objective questions from the 2021 Neco Physics examination.
Difficulty level: Hard .
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