Nucleus $$\(P\)$$ undergoes $$\(\alpha\)$$-decay to form nucleus $$\(Q\)$$. Nucleus $$\(Q\)$$ then undergoes a further decay to form nucleus $$\(R\)$$. The proton and nucleon numbers of $$\(P\)$$ and $$\(R\)$$ are shown in Fig. 6.1. Fig. 6.1 (i) On Fig. 6.1, draw a cross $$\((\times)\)$$ to show the proton number and nucleon number of Q . Label your cross Q. (ii) State the names of the particles emitted as $$\(Q\)$$ decays to form $$\(R\)$$. ....................................................................................................................................... . .................................................................................................................................
Exam No：9702_w24_qp_22 Year：2024 Question No：6(b)
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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