Igcse Model Questions Vol1 2025 Physics Question 12
Practice objective / multiple choice question 12 from the 2025 Igcse Model Questions Vol1 Physics examination.
A sample contains \(2.0\times10^{6}\) atoms of isotope A which decays to isotope B with a half‑life of 30 min. Isotope B further decays to a stable isotope C with a half‑life of 10 min. After exactly 1 hour, what fraction of the original atoms are present as isotope B? Give your answer as a decimal to three significant figures.
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This is Igcse Model Questions Vol1 2025 Physics Question 12. It is one of the objective questions from the 2025 Igcse Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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