Igcse Model Questions Vol1 2022 Physics Question 3
Practice objective / multiple choice question 3 from the 2022 Igcse Model Questions Vol1 Physics examination.
A radioactive sample contains two isotopes, A and B, that decay independently. Isotope A has a half‑life of \(30\) min and an initial activity of \(800\) Bq. Isotope B has a half‑life of \(2\) h and an unknown initial activity. After exactly \(1\) h the total activity of the sample is measured to be \(500\) Bq.\n\n(a) Determine the initial activity of isotope B (in Bq).\n(b) Using the decay constant of B, calculate the number of atoms of B present initially. (Take \(\lambda =\ln 2 / t_{1/2}\) and \(A = \lambda N\).)
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This is Igcse Model Questions Vol1 2022 Physics Question 3. It is one of the objective questions from the 2022 Igcse Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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