only) and mesons (pion and antineutron only) and mesons kaon only) (pion and kaon only) Understand the nature of Only knowledge of up (u), down neutron decay in terms of (d) and strange (s) quarks and change of quark flavour their antiquarks will be tested The decay of the neutron should be known 3.2.1.7 Change of quark character in β− decay 5 How do forces actually act Name the four fundamental 3.2.1.4 Four fundamental 4.5 between particles? interactions interactions: gravity, electromagnetic, weak nuclear, The concept and properties Use the concept of exchange strong nuclear. (The strong of exchange particles are particles to describe forces nuclear force may be referred to discussed here. between particles as the strong interaction) Know that virtual photons are The concept of exchange particles the exchange particle for the to explain forces between electromagnetic force elementary particles Know and that W+ and W− are Knowledge of the gluon, Z0 and exchange particles in weak graviton will not be tested interactions The electromagnetic force; virtual Know that the pion is the photons as the exchange particle exchange particle of the strong nuclear force The weak interaction limited to β− and β+ decay, electron capture Construct simple (Feynman) and electron-proton collisions; diagrams to represent W+ and W− as the exchange interactions particles Appreciate the analogy of Simple diagrams to represent the momentum transfer of a heavy above reactions or interactions in ball thrown from one person to terms on incoming and outgoing another particles and exchange particles 3.2.1.7 Change of quark character in β− and in β+ decay
only) and mesons (pion and kaon only) Understand the nature of neutron decay in terms of change of quark flavour antineutron only) and mesons (pion and kaon only) Only knowledge of up (u), down (d) and strange (s) quarks and their antiquarks will be tested The decay of the neutron should be known 3.2.1.7 Change of quark character in β− decay 5 How do forces actually act between particles? The concept and properties of exchange particles are discussed here. Name the four fundamental interactions Use the concept of exchange particles to describe forces between particles Know that virtual photons are the exchange particle for the electromagnetic force Know and that W+ and W− are exchange particles in weak interactions Know that the pion is the exchange particle of the strong nuclear force Construct simple (Feynman) diagrams to represent interactions Appreciate the analogy of momentum transfer of a heavy ball thrown from one person to another 3.2.1.4 Four fundamental interactions: gravity, electromagnetic, weak nuclear, strong nuclear. (The strong nuclear force may be referred to as the strong interaction) The concept of exchange particles to explain forces between elementary particles Knowledge of the gluon, Z0 and graviton will not be tested The electromagnetic force; virtual photons as the exchange particle The weak interaction limited to β− and β+ decay, electron capture and electron-proton collisions; W+ and W− as the exchange particles Simple diagrams to represent the above reactions or interactions in terms on incoming and outgoing particles and exchange particles 3.2.1.7 Change of quark character in β− and in β+ decay 4.5