Neco Model Questions Vol1 2021 Physics Question 50
Practice objective / multiple choice question 50 from the 2021 Neco Model Questions Vol1 Physics examination.
A sample contains \(1.0\times10^{12}\) atoms of isotope A (half‑life \(2\) h, \(0.5\) MeV beta decay) and \(2.0\times10^{12}\) atoms of isotope B (half‑life \(6\) h, \(5.0\) MeV alpha decay). After a time \(t\) the total activity is measured to be \(1.5\times10^{8}\) decays s⁻¹. Determine (a) the elapsed time \(t\) in hours (to two decimal places) and (b) the total energy released up to that time in joules (to two significant figures). (Use \(1\,\text{eV}=1.602\times10^{-19}\) J.)
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This is Neco Model Questions Vol1 2021 Physics Question 50. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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