Igcse Model Questions Vol1 2024 Physics Question 20
Practice objective / multiple choice question 20 from the 2024 Igcse Model Questions Vol1 Physics examination.
A sample contains 2.0 g of pure \(^{226}\text{Ra}\) (half‑life 1600 yr). It decays to \(^{222}\text{Rn}\) (half‑life 3.8 d) which quickly decays to stable \(^{206}\text{Pb}\), emitting an alpha particle of 4.78 MeV in the \(^{226}\text{Ra}\rightarrow^{222}\text{Rn}\) step. Assuming secular equilibrium has been reached, calculate (a) the activity of the \(^{222}\text{Rn}\) gas in becquerels, and (b) the total power (in watts) emitted as alpha particles from the original \(^{226}\text{Ra}\) sample at equilibrium. Give your answers to two significant figures.
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This is Igcse Model Questions Vol1 2024 Physics Question 20. It is one of the objective questions from the 2024 Igcse Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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