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QLDPhysicsQuick questions
Unit 4: Revolutions in modern physics
Quick questions on Fundamental particles and the Standard Model: QCE Physics Unit 4
7short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is baryons (three-quark composites)?Show answer
Made of three quarks. Examples:
What is mesons (quark-antiquark pairs)?Show answer
Made of one quark and one antiquark. Examples:
What is confusing leptons with hadrons?Show answer
Electrons are leptons (elementary). Protons and neutrons are baryons (composite).
What is wrong charge calculation?Show answer
$u$ has charge $+2/3$; $d$ has charge $-1/3$. Proton: $uud$ gives $+1$. Neutron: $udd$ gives $0$.
What is treating quarks as observable in isolation?Show answer
Quarks are confined; only colour-neutral combinations are observed.
What is confusing baryons with mesons?Show answer
Three quarks = baryon. Quark-antiquark = meson.
What is forgetting that the photon is a gauge boson?Show answer
The photon mediates electromagnetism in the Standard Model.
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