# Matter and Radiation, Quarks and Leptons

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What is an Isotope?
Atoms with the same number of protons, diffferent number of neutrons
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What is the charge of a proton, neutron and electron (in coloumbs)?
Proton: 1.6x10^-19 Neutron: 0 Electron: -1.6x10^-19
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What is the mass of a proton, neutron and an electron (in kg) ?
Proton: 1.67x10^-27 Neutron: 1.67x10^-27 Electron: 9.11x10^-31
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How do you work out specific charge?
Charge (Proton number multiply by charge of electron) DIVIDED BY Mass (Neucleon number multiply by the mass)
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Describe how the strong force is felt by two neucleons.
At short range, below 0.5fm, the strong nuclear force is repulsive. Betweeen 0.5fm - 3fm the strong nuclear force is attractive. After 3fm the strong force falls away as it is a very short range force.
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In terms of the element X, write an equation of alpha decay.
(Draw on)
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In terms of element X, write an equation of betay decay.
(Draw on)
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The production of a particle and a antiparticle is due to what theory? Describe what happens?
Pair Production. When a photon is energiesed and has enough energy to produce a particle-antiparticle pair. These then move in opposite directions due to the rupulsion of their charges. They may also collide with the opposite particle and annihiliate
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How does matter turn into energy?
By annihilation, where a particle and an antiparticle collide, forming two gamma photons which move in opposite directions.
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Stae the nature of an alpha particle
A helium nucleous
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Draw a feynman diagram of beta + decay
(draw)
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Draw a fenyman diagram of beta- decay
(draw)
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Draw a feynman diagram of electron capture
(draw)
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When does electron capture take place?
A proton rich nucleous turns a proton into a neutron, through the weak interaction
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Give the quark compostition od a proton and a neutron
Proton: uud Nuetron: udd
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What is the difference between and kaon and a pion?
Kaons are made up of two quarks, one strange and one anti. Pions are made of two quarks, one ordinary one strange.
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What is the difference between lepton and hardons?
Leptons dont experience the strong nuclear force, where as hadrons do.
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How to disquish between mesons and baryons?
Baryons experience the weak interaction where as mesons dont.
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What conservation rules must apply during interaction.
Baryon number, Lepton Number, Charge
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Show this equation obeys the conservation rules.. n + μ+ ----> p + ̅νμ
(draw)
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## Other cards in this set

### Card 2

#### Front

Proton: 1.6x10^-19 Neutron: 0 Electron: -1.6x10^-19

#### Back

What is the charge of a proton, neutron and electron (in coloumbs)?

### Card 3

#### Front

Proton: 1.67x10^-27 Neutron: 1.67x10^-27 Electron: 9.11x10^-31

### Card 4

#### Front

Charge (Proton number multiply by charge of electron) DIVIDED BY Mass (Neucleon number multiply by the mass)

### Card 5

#### Front

At short range, below 0.5fm, the strong nuclear force is repulsive. Betweeen 0.5fm - 3fm the strong nuclear force is attractive. After 3fm the strong force falls away as it is a very short range force.