Potassium-40 $$\(\left({ }_{19}^{40} \mathrm{~K}\right)\)$$ undergoes $$\(\beta^{-}\)$$decay to form a nuclide of element X . Particle Z is emitted during the decay. The equation for the decay is shown. $$\[ { }_{19}^{40} \mathrm{~K} \rightarrow{ }_{Q}^{P} \mathrm{X}+{ }_{S}^{R} \beta^{-}+\mathrm{Z} \]$$ (i) State the values of $$\(P, Q, R\)$$ and $$\(S\)$$. $$\(P=\)$$ ............................................. $$\(R=\)$$ ............................................. $$\(Q=\)$$ ............................................. $$\(S=\)$$ ............................................. (ii) State the name of particle Z . ................................................................................................................................. (iii) State the name of the class of fundamental particle to which both the $$\(\beta^{-}\)$$particle and particle $$\(Z\)$$ belong. .................................................................................................................................
Exam No：9702_w24_qp_21 Year：2024 Question No：5(a)
Answer:
Knowledge points:
11.2.1 appreciate that protons and neutrons are not fundamental particles since they consist of quarks
11.2.2 describe a simple quark model of hadrons in terms of up, down and strange quarks and their respective antiquarks
11.2.3 describe protons and neutrons in terms of a simple quark model
11.2.4 appreciate that there is a weak interaction between quarks, giving rise to β decay
11.2.5 describe β– and β+ decay in terms of a simple quark model
11.2.6 appreciate that electrons and neutrinos are leptons
Solution:
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