Neco Model Questions Vol1 2022 Physics Question 1
Practice objective / multiple choice question 1 from the 2022 Neco Model Questions Vol1 Physics examination.
A 5.0 g mixture of two radioactive isotopes, A (half‑life 30 min, decays 100 % to daughter C) and B (half‑life 2 h, decays 80 % to C and 20 % to a stable nuclide D), is prepared. After exactly 3 h the activity of daughter C is measured as \(1.0\times10^{17}\) Bq. The atomic masses are 240 u for A and 238 u for B. Assuming each decay that produces C contributes one count to the activity, determine the initial mass of isotope A in the mixture (in grams, to two decimal places).
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This is Neco Model Questions Vol1 2022 Physics Question 1. It is one of the objective questions from the 2022 Neco Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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