Waec Model Questions Vol1 2019 Physics Question 29
Practice objective / multiple choice question 29 from the 2019 Waec Model Questions Vol1 Physics examination.
A 2.0 g sample of the radioactive isotope ^238U (half‑life 4.5 × 10⁹ yr) decays by α‑emission to ^234Th, which in turn decays by β‑emission to the stable isotope ^234Pa (half‑life 1.0 × 10⁶ yr). Initially the sample contains only ^238U. Calculate the mass of the stable ^234Pa present after 2.0 × 10⁶ yr. (Atomic masses: ^238U = 238 u, ^234Th = 234 u, ^234Pa = 234 u; 1 u = 1.6605 × 10⁻²⁴ g.)
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This is Waec Model Questions Vol1 2019 Physics Question 29. It is one of the objective questions from the 2019 Waec Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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