Particles and Radiation Flashcards
What is the Baryon number of mesons?
0
What interaction is strangeness conserved in?
Strong Interaction
What happens in the process of electron capture?
Orbital electron interacts with a proton in the nucleus, causing a neutron to form and an neutrino is released
What three things do exchange particles transfer?
Force, energy and momentum
What property defines a hadron?
They experience the strong force
Give three properties of the strong nuclear force
Has a short range, attractive from 0.5-3.0fm, repulsive from <0.5fm, cross-over distance from 0.1-1.0fm
What are the three types of neutrino?
Electron, tau and muon
Why are neutrinos often produced?
To conserve lepton number
What is the effect of increasing the frequency of light on emitted electrons?
Electrons will have greater kinetic energy, as E=hf
What is the effect of increasing the intensity of the light on emitted electrons?
Number of electrons emitted per second increases as more photons are striking the metal surface.
What is the max kinetic energy of emitted electrons?
Photon energy - work function energy
What happens to electrons in higher energy levels when an electron in the ground state is emitted?
They will fall down to fill spaces in the lower levels via various different routes and emitting photons in the process
Give a similarity between ionisation and excitation
Electrons receive energy for both processes to occur
Describe the process by which mercury atoms become excited in a fluorescent tube
Electrons flow through the tube which collide with mercury atoms raising electrons (within the atom) to higher energy levels
What kind of experiment would show that electrons have a wave-like nature?
Diffraction experiments
