A-LevelPhysicsNuclear physics9702/12 · Feb/Mar 2021 · Q391 Mark

The figure shows part of a chart of nuclides where neutron number is plotted against proton number. An unstable nuclide X decays by emitting an α-particle. Which nuclide is formed by the decay of nuclide X?

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Anuclide A at (proton number 92, neutron number 141)

Bnuclide B at (proton number 92, neutron number 143)

Cnuclide C at (proton number 93, neutron number 147)

Dnuclide D at (proton number 95, neutron number 144)

✓ Correct answer

B: nuclide B at (proton number 92, neutron number 143)

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Topic: Nuclear physics, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2021 Paper 1 Variant 2, question 39.

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