CAIE A-Level Physics AS 11.2.5 The Changes to Quark Composition That Take Place During and Decay Questions

Describe beta-minus and beta-plus decay through quark-flavour changes, emitted leptons and the weak interaction in complete nuclear equations.

Exam points

Describe beta-minus and beta-plus decay as quark-flavour changes in a nucleon.
Relate weak-interaction quark changes to the emitted beta particle and neutrino or antineutrino.

[Maximum number: 1]

Nucleus P and nucleus Q are isotopes of the same element.
Nucleus Q is unstable and emits a $\beta^{-}$ 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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