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]

A nucleus of carbon-10, ${ }_{6}^{10} \mathrm{C}$ , decays by beta-emission to form a nucleus of boron-10, ${ }_{5}^{10} \mathrm{~B}$ .

For this decay process, what is the change to a nucleon and what is the change in the quark composition of the nucleon?

change to nucleon

change in
quark composition

proton to neutron

down becomes up

proton to neutron

up becomes down

neutron to proton

down becomes up

neutron to proton

up becomes down

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CAIE A-Level Physics AS 11.2.5 The Changes to Quark Composition That Take Place During and Decay Questions question 1