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Physics · Oct / Nov 2016 · Paper 12 · Question 40

5054Radioactive decay

A nucleus of uranium \(^{238}_{92}\text{U}\) decays to thorium by emitting an alpha-particle. What is the resulting thorium nucleus?

  1. A\(^{234}_{90}\text{Th}\)
  2. B\(^{236}_{90}\text{Th}\)
  3. C\(^{238}_{93}\text{Th}\)
  4. D\(^{239}_{92}\text{Th}\)

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Correct answer: A. \(^{234}_{90}\text{Th}\)

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