May/June 2026 Paper 23

2026 · 5 questions · 39 parts · 60 marks

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5(a)Quarks Leptons AntiparticlesEasy1 mark

State what is meant by a meson.

5(b)Quarks Leptons AntiparticlesMedium3 marks

The elementary charge is

e

Explain, in terms of quark composition, how a baryon may have an overall charge of:

Answer

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5(c)

The nuclide

_{8}^{18} X

undergoes

β^{+}

decay to produce nuclide

_{Q}^{P} Y

and one other particle Z, as shown in the equation

_{8}^{18} X \to_{Q}^{P} Y +_{S}^{R} β^{+} +_{0}^{0} Z

5(c)(i)Radioactive Decay Nuclear EquationsEasy2 marks

State the values of

P

Q

R

and

S

5(c)(ii)Quarks Leptons AntiparticlesEasy1 mark

State the name of particle Z.

5(c)(iii)Quarks Leptons AntiparticlesEasy1 mark

State the net change in quark composition as nuclide X turns into nuclide Y.

5(c)(iv)Radioactive Decay Nuclear EquationsMedium2 marks

Explain why the emission of particle Z results in the

β^{+}

particles from the decays of different nuclei of

_{8}^{18} X

having a continuous range of kinetic energies.

Answer

0 words