Neco 2025 Physics Question 40
Practice objective / multiple choice question 40 from the 2025 Neco Physics examination.
A sample contains two radioactive isotopes. Isotope A decays by \(\alpha\)\-emission with a half\-life of 2.0\,h and an initial activity of 8.00\times10^{3}\,Bq. Isotope B decays by \(\beta\)\-emission with a half\-life of 6.0\,h and an unknown initial activity. After 4.0\,h the total activity of the sample is measured to be 5.00\times10^{3}\,Bq. Determine the initial activity of isotope B, in becquerels, correct to three significant figures.
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About This Question
This is Neco 2025 Physics Question 40. It is one of the objective questions from the 2025 Neco Physics examination.
Difficulty level: Hard .
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