Particle Physics

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What is the mass of a proton or neutron?
1.67x10^-27 kg
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What is the mass of an electron?
9.11x10^-31 kg
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What is the charge on an electron?
-1.60x10^-19 C
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What is the equation for specific charge?
specific charge =
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At what range does the strong nuclear force become repulsive?
~0.5 fm
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At what range does the strong nuclear force become ineffective?
~3 fm
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What is the equation for the energy of a photon?
E = hf
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What is the equation for the frequency of light?
f =
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What is the relative charge of a positron?
+1
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What is the relative charge on an anti-proton?
-1
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What is the charge on an electron neutrino?
0, as is the same with all neutrinos.
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What is it called when a photon has too much energy and produces a electron-positron pair?
Pair production.
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What is the equation for the minimum energy needed for pair production?
E = 2E
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What will happen if a electron and positron interact?
Annihilation, the mass of both particles will be converted into energy in the form of two gamma ray photons.
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What is the equation for the minimum energy of a photon produced via annihilation?
E = E
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What is the name of the group of sub-atomic particles that are affected by the strong nuclear force?
Hadrons.
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Leptons are all examples of what?
Fundamental particles.
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Hadrons are all made up of?
Quarks
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Baryons are made upof how many quarks?
3
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Mesons are made up of how many quarks?
2
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What is the baryon number of a baryon, anti-baryon and non-baryon?
+1, -1, and 0 respectively.
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What are the four fundamental forces?
The strong nuclear force, the weak nuclear force, electromagnetic, and gravitational.
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Which fundamental force causes beta decay?
The weak nuclear force.
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Why can you not get anti-mesons?
Mesons are all made of a quark and a anti-quark, you cannot have a meson made of two quarks, or two anti-quarks.
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Which type of meson contains strange quarks?
Kaons.
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What is the relative charge of a muon?
-1
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Protons are made up of which three quarks?
uud
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What is the charge, baryon number, and strangeness on a strange quark?
-1/3, 1/3, and -1 respectively.
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What is the strangeness of an up quark?
0
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Describe Quark Confinement
The fact that it is not possible to get a quark on its own is due to how if you were able to provide enough energy to remove a quark from a proton then the energy would simply turn into mass, creating a pair of quarks. This is called quark confinem
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If you were to change an up quark to a down quark it could be described as changing the quarks _________
Character. For example in Beta-Minus decay
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Which properties are conserved in all particle interactions?
Charge, and Baryon Number?
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Strangeness is only conserved in which type of interaction?
Strong Interactions.
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What is the exchange particle for strong interactions?
The gluon
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What is the exchange particle for electromagnetic interactions?
The virtual photon
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What are the exchange particles for weak interactions?
W+, and W- bosons
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In a feynman diagram, the exchange particles are represented by what?
Wiggly lines (technical term)
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Card 2

Front

What is the mass of an electron?

Back

9.11x10^-31 kg

Card 3

Front

What is the charge on an electron?

Back

Preview of the front of card 3

Card 4

Front

What is the equation for specific charge?

Back

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Card 5

Front

At what range does the strong nuclear force become repulsive?

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