Particles-Exam mistakes-1 4.5 / 5 based on 2 ratings ? PhysicsParticle physicsASAQA Created by: tahliaDCreated on: 20-10-15 13:04 What is the quark composition of the positive pion? u(anti)d 1 of 15 Name a stable baryon Proton 2 of 15 Which is the most stable baryon? Proton 3 of 15 Name some other stable sub-atomic particles Electrons, positrons, neutrino, antineutrino 4 of 15 In what interaction is strangeness not conserved? Weak 5 of 15 Briefly define what is meant by an 'excited' particle A particle which is at a greater energy level than it's ground state 6 of 15 When a question states that a beta-minus particle has been emitted what should you think about? Beta-minus decay, that a neutron has been turned into a proton, beta-minus particles are the same as electrons 7 of 15 If an electron collides with a neutral atom what might happen? Ionisation may occur 8 of 15 What does ionisation mean in this sense? That another electron has been knocked out of the atom by the other electron 9 of 15 How does this change the atom? The atom becomes a positively charged ion and loses an electron 10 of 15 What particles are present after this collison? A positively charged ion, 2 electrons 11 of 15 What is the exchange particle for the gravitational force? graviton 12 of 15 What is the exchange particle for the strong force? gluon 13 of 15 What is the exchange particle for the weak force? w+, w-. z 14 of 15 What is the exchange particle for the electromagnetic force? photon 15 of 15
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