O-LevelPhysicsNuclear Physics5054/11 · May/June 2011 · Q391 Mark

A radioactive nuclide ²³⁸₉₂U decays into thorium by emitting an alpha-particle. The thorium then decays into protactinium by emitting a beta-particle. What is the symbol for protactinium?

A²³⁰₉₀Pa

B²³⁴₈₉Pa

C²³⁴₉₀Pa

D²³⁴₉₁Pa

✓ Correct answer

D: ²³⁴₉₁Pa

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Topic: Nuclear Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2011 Paper 1 Variant 1, question 39.

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