Neco Model Questions Vol1 2020 Physics Question 17
Practice objective / multiple choice question 17 from the 2020 Neco Model Questions Vol1 Physics examination.
A radioactive sample contains two isotopes, A and B, that both decay by beta emission. Isotope A has a half‑life of 5 min and an initial activity of 800 Bq. Isotope B has a half‑life of 20 min and an initial activity of 200 Bq. After a certain time the total activity of the sample is measured to be 500 Bq. Calculate the elapsed time (in minutes) to the nearest tenth.
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About This Question
This is Neco Model Questions Vol1 2020 Physics Question 17. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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