Physics 1.4 Particles and Antiparticles Flashcards
What is the product of an energy to mass conversion?
When energy is converted into mass, you get equal amounts of matter and antimatter.
What is the symbol, relative charge, mass and rest energy of a proton?
Symbol: p
Relative charge: +1
Mass: 1.67(3) * 10^-27kg
Rest Energy: 938(.3)MeV
What is the symbol, relative charge, mass and rest energy of an antiproton?
Symbol: -p (bar over p)
Relative charge: -1
Mass: 1.67(3) * 10^-27kg
Rest Energy: 938(.3)MeV
What is the symbol, relative charge, mass and rest energy of a neutron?
Symbol: n
Relative Charge: 0
Mass: 1.67(5) * 10^-27
Rest Energy: 939(.6)MeV
What is the symbol, relative charge, mass and rest energy of an antineutron?
Symbol: -n (bar over n)
Relative Charge: 0
Mass: 1.67(5) * 10^-27kg
Rest Energy: 939(.6)MeV
What is the symbol, relative charge, mass and rest energy of an electron?
Symbol: e-
Relative Charge: -1
Mass: 9.11 * 10^-31
Rest Energy: 0.51(1)MeV
What is the symbol, relative charge, mass and rest energy of a positron?
Symbol: e+
Relative Charge: +1
Mass: 9.11 * 10^-31kg
Rest Energy: 0.51(1)MeV
What is the symbol, relative charge, mass and rest energy of a neutrino?
Symbol: νe
Relative Charge: 0
Mass: 0kg
Rest Energy: 0kg
What is the symbol, relative charge, mass and rest energy of an antineutrino?
Symbol: νe
Relative Charge: 0
Mass: 0kg
Rest Energy: 0MeV
What is the value, in joules, of 1MeV?
1MeV=1.60 * 10^-13J
Define annhilation
Annihilation occurs when a particle and its corresponding antiparticle meet and their mass is converted into radiation energy, in the form of two photons.
Why are two photons released in annihilation?
Two photons are released to conserve momentum.
Define pair production
In pair production, a photon creates a particle and its corresponding antiparticle, vanishing in the process.
What is the minimum energy of two photons produced in annihilation?
Twice the rest energy of one of the particles.
