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CAIE A-Level Physics 11.2.5 Quark Changes in Beta Decay

Practise describing beta-minus and beta-plus decay as quark-composition changes, relating the change to the emitted lepton and conservation laws.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • describe the quark-composition change in beta-minus decay
  • describe the quark-composition change in beta-plus decay and relate it to the emitted lepton

11.2.5—The changes to quark composition that take place during β– and β+ decay question 1

[Maximum number: 1]

Nucleus P and nucleus Q are isotopes of the same element.
Nucleus Q is unstable and emits a β−\beta^{-}particle to form nucleus R.

When nucleus Q decays to form nucleus R, the quark composition of a nucleon changes. State the change to the quark composition of the nucleon.

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