Neco 2022 Physics Question 11
Practice objective / multiple choice question 11 from the 2022 Neco Physics examination.
A sample contains 2.0 g of isotope X (molar mass \(100\ \text{g·mol}^{-1}\), half‑life \(30\ \text{min}\)) and 3.0 g of isotope Y (molar mass \(150\ \text{g·mol}^{-1}\), half‑life \(2\ \text{h}\)). Both isotopes decay by emitting one particle per decay. At what time after the sample is prepared will the activity of X become one‑third of the activity of Y? Give your answer in minutes (nearest minute).
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About This Question
This is Neco 2022 Physics Question 11. It is one of the objective questions from the 2022 Neco Physics examination.
Difficulty level: Hard .
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