Igcse Model Questions Vol1 2022 Physics Question 7
Practice objective / multiple choice question 7 from the 2022 Igcse Model Questions Vol1 Physics examination.
Two radioactive isotopes A and B are mixed in a sealed source. Isotope A decays by \(\alpha\)-emission with a half‑life of \(30\ \text{min}\) and releases \(5.0\ \text{MeV}\) per decay. Isotope B decays by \(\beta\)-emission with a half‑life of \(2\ \text{h}\) and releases \(1.2\ \text{MeV}\) per decay. Initially the source contains \(2.0\times10^{12}\) atoms of A and \(5.0\times10^{12}\) atoms of B. After an elapsed time \(t\) the total power emitted by the source is measured to be \(1.2\times10^{-6}\ \text{W}\). Determine \(t\) (in hours, to two significant figures).
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About This Question
This is Igcse Model Questions Vol1 2022 Physics Question 7. It is one of the objective questions from the 2022 Igcse Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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