Particle Physics Flashcards
The charge of a proton in Coulombs
1.6 x 10^-19
Annihilation
When matter and antimatter interact , a pair of photons will be emitted.
Electron capture
When proton of nucleus interact with shell electron to make neutron.
Isotopes
An atom of the same element with the same number of proton but a different nucleon number or number of neutron.
(Strong force interaction)
- closer than 3 fm
- closer than 0.4 fm
- greater than 3 fm
- Attracts really strongly
- Repels
- attract weakly
Kaon decay into
pion
During strong interaction
strangness need to be conserve
eV —-> J
x 1.6 (10^ -19)
J —-> eV
/ 1.6 (10^ -19)
Exchange particle (Use)
Particle that mediate the four fundamental force
Hold particles together and inpart force
Four fundamental force
Electromagnetic force , Strong force , weak force and gravity
Cloud chamber (highly ionising alpha particles) Y?
Broad , straight and definite tracks ( alpha particle is bigger that electron and having double charge , so it is more ionising )
Cloud chamber (ionising beta particles)
Thin , straight or curved tracks
Cloud chamber ( weakly gamma rays)
left no tracks at all
Exchange particle of strong force
gluon
Exchange particle of weak force
W+ ,W-
Exchange particle of electromanetic force
photon
pion made of ………..quarks
u ,d , anti-u , ant-d
Specific charge
charge/mass (Ckg^-1)
Ions
Atom that have lost or gained electrons
Lost electron—–positive ions
Gain electron—–negative ions
All baryons eventually decay into…
Proton (it is the only stable baryon )
During pair production ,if the photon energy is greater than the rest mass of an electron and a positron , what will happen ?
Any excess energy (i.e grater than the rest mass of electron and positron ) will become kinetic energy of electron and positron .
