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What are the conservation laws.
conservation of charge
conservation of baryon number
conservation of lepton number.
What are the four fundamental forces of the universe?
gravitational
weak
strong
electromagnetic
Gravitational force
all matter
infinite range
is the weakest of the fources.
Weak
leptons, and quarks
short range
change in quark flavour
10^-10 lifetime
if neutrinos are present it is weak.
strong
10^-24 lifetime
all particles are hadrons
leptons dont feel it
no change in quark flavour
electromagnetic
short lifetime 10^-12 10^-18
if gamma photon emitted it is em
charged particles only
no change in quark flavour