May/June 2026 Paper 41

2026 · 10 questions · 45 parts · 100 marks

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9(a)Binding Energy Fission FusionEasy2 marks

Define the mass defect of a nucleus.

Answer

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9(b)(i)Binding Energy Fission FusionHard4 marks

Thorium-228 (

_{90}^{228} Th

) is radioactive. Table 9.1 shows the mass defects of thorium-228 and some other nuclides.

Table 9.1

Use the data in Table 9.1 to explain why thorium-228 is an

α

-emitter and not a

β^{-}

emitter or a

β^{+}

emitter.

Answer

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9(b)(ii)Binding Energy Fission FusionMedium3 marks

Calculate the energy, in MeV, released by the

α

-decay of one thorium-228 nucleus. Give your answer to three significant figures.