Particles and Radiation 0.0 / 5 ? PhysicsParticle physicsASAQA Created by: ravioliCreated on: 12-12-16 16:56 What does the simple model of an atom consist of? Proton, neutron and electron 1 of 22 What is the equation used for specific charge? charge/ mass 2 of 22 Define an isotope An isotope is an atom of an element that has the same number of protons but a different number of neutrons 3 of 22 What is the range of the strong nuclear force? Repulsive below 0.5fm, strong attraction between 0.5fm and 3fm and virtually no attraction or repulsion after 3fm 4 of 22 What is the strong nuclear force responsible for? The stability of the atoms nucleus 5 of 22 What does the gravitational force do? Causes all the nucleons in the nucleus to attract each other due to their mass 6 of 22 What is weak interaction? A fundamental force that has a short range and can change the character of a quark 7 of 22 What does the electromagnetic force do? Causes positively charged protons in the nucleus to repel each other 8 of 22 What are the properties of an antiparticle? They have the opposite charge to its corresponding particle and have the same mass 9 of 22 Define a photon A discrete wave packet of EM waves 10 of 22 Define pair production Converting energy into mass, where a gamma ray photon has enough energy to produce a particle and antiparticle pair. 11 of 22 What is the minimum energy needed for pair production occur? The total rest energy of the particles that are produced in pair production 12 of 22 What does the minimum energy needed for pair production equal to? 2*rest energy of particle type produced 13 of 22 Define annihilation Process where a particle and antiparticle meet and their mass is converted into energy in the form of a pair of gamma ray photons 14 of 22 What is the minimum energy of photon produced equal to in annihilation? rest energy of particle type annihilated 15 of 22 In the electromagnetic force, what is the exchange particle? Virtual photons 16 of 22 What is released in the decay of a neutron? A proton, electron and anti-electron neutrino 17 of 22 Define electron capture Process in which an inner-shell electron of an atom is captured by the nucleus 18 of 22 Name the different conservation rules 1. charge 2. energy or mass 3. baryon number 4. lepton number 5. strangeness (in weak interactions) 19 of 22 Name a property of a proton A proton is the only stable baryon into which other baryons eventually decay 20 of 22 What are strange particles? Particles that are produced through strong interaction and decay through weak interaction. These are also always created in pairs. 21 of 22 What is energy always measured in in this topic? Electronvolts (eV) 22 of 22
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