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mercury vapour emits photons of what light?
UV
what has a higher rest energy, proton or neutron?
neutron
what is needed to turn a proton into a neutron?
energy
does strangeness need to be conserved?
yes
what is the only stable baryon?
proton
define an exchange particle
a particle that is transferred between 2 particles when a force acts between them
electron + positron → ?
2 photons
define a meson
particles containing a quark and an antiquark
how to calculate specific charge?
charge / mass
the higher the ratio of neutrons to protons in the nucleus, what happens to repulsive EM force?
decreases
beta minus decay emits what?
an electron and an electron anti-neutrino
when you increase frequency of light, what happens to electrons emitted?
increased KE
stopping speed equals?
kinetic energy / electron energy
what is always created in pairs?
strangeness
what force is important in nucleus?
strong nuclear force
give an example of pair production?
proton + proton
what does annihilation produce?
2 gamma photons
what range does strong nuclear force work?
0.5fm to 3fm
what 2 subsections are hadrons?
baryons and mesons
what is beta minus decay?
n → p + electron + electron anti neutrino
what is beta plus decay?
p → n + positron + electron neutrino
what is electron capture?
p + electron → n + neutrino
how do you convert from eV to J?
x 1.6×10-19
what is the charge of a proton?
1.6×10^-19
how does antineutrino interact?
only via weak interaction
how does a positron interact?
via electromagnetic interaction and weak interaction
what is the mass of a nucleon?
1.67×10^-27
what is the speed equation?
v² = 2E / m
in what interaction can strangeness change?
weak
what is a meson made up of?
1 quark 1 antiquark
what is a baryon made up of?
3 quarks
what is an antiparticle?
equal mass and opposite charge to a particle
E = ?
mc²
what is the top and bottom number next to a particle?
top- mass
bottom- charge
what type of particle doesn’t experience strong force?
lepton
what causes electron momentum to change in pair production?
conservation or momentum
what does a muon decay into?
electron, electron anti neutrino and muon neutrino
