10 questions🇬🇧English
🌌 Particles, Antiparticles & Quarks – A-level
Physics · A-level — practises particle classification, quarks, conservation laws and exchange particles
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Questions
What is the quark composition of a proton?
udd
uuu
uud
uds
20s
Which of these particles is a lepton?
Kaon
Pion
Proton
Muon
20s
What is a meson made of?
Three antiquarks
One quark and one antiquark
Two quarks
Three quarks
20s
Which exchange particle mediates β⁻ decay?
Gluon
Z⁰ boson
W⁻ boson
W⁺ boson
20s
The rest energy of an electron is 0.511 MeV. What is the minimum photon energy needed to produce an electron–positron pair?
2.04 MeV
0.256 MeV
1.02 MeV
0.511 MeV
30s
During β⁻ decay, which quark change takes place inside the nucleus?
A strange quark changes into an up quark
A down quark changes into a strange quark
An up quark changes into a down quark
A down quark changes into an up quark
30s
The K⁺ meson has quark composition us̄. What is its strangeness?
+2
−1
+1
0
30s
In electron capture, p + e⁻ → n + X. What is particle X?
Muon neutrino
Positron
Electron neutrino
Electron antineutrino
30s
The Λ⁰ baryon (uds) decays into a proton and a π⁻. Which interaction is responsible for this decay?
Gravitational interaction
Strong interaction
Electromagnetic interaction
Weak interaction
30s
A proton and an antiproton at rest annihilate. Why must at least two photons be produced rather than one?
To conserve baryon number
To conserve momentum
To conserve energy
To conserve charge
30s