Overview of Unit 1

HideShow resource information
View mindmap
  • Unit 1- Particles and Quantum Phenomena
    • Matter and Radiation
      • Specific Charge = charge/mass
      • Beta Radiation
        • Atomic/proton number increases by 1
        • Neutron number remains the same
      • Electromagnetic waves made up of an electric and magnetic field
      • Anti-Matter
        • Every particle has an anti particle
        • When these particles meet they annihilate themselves
        • Pair production is caused by a high energy photon
      • W Bosons
        • Exchange particles with non zero rest mass
        • Have very short ranges
      • Isotopes
        • Atom with the same number of protons but different number of neutrons
        • A isoptope nucleus is called a nuclide
      • Interactions
        • Exchange particles are the action of a force
        • Beta+ decay is a proton changing into a neutron, neutrino and positron
    • Quarks and Leptons
      • Hadrons
        • Baryons: Protons, neutrons and antiparticles
        • Mesons: Kaons and Pions
        • Interact through the strong force and decay through the weak force
      • Leptons
        • Electrons, muons, neutrinos and their antiparticales
        • interact through the weak force
        • Neutrinos do not often interact
      • Lepton Rules
        • Interaction between a lepton and a hadron a neutrino/anti neutrino can form it's corresponding charged lepton
        • The lepton number is conserved in any change
        • In muon decay the muon becomes a muon neutrino
      • Quarks
        • Baryons consist of 3 quarks or antiquarks
        • Mesons consist of a quark and an antiquark
        • 3 quarks anti quarks are up, down and strange
        • Strangeness is always conserved in the strong interaction
        • Strangeness is not conserved in the weak interaction
      • Conservation
        • Energy and charge must be conserved
        • Baryon and lepton number must be conserved
    • Quantum Phenomena
      • Photo-electricity
        • Electrons emitted if the photon has the threshold frequency
        • Number of electrons emitted is proportional to the intensity of light
        • Work function is the minimum amount of energy needed to escape the metals surface
        • 1 photon to 1 electron
      • Electron Collisions
        • Ionisation is the removal of an electron from the outer shell of an atom
        • Electrons excite other electrons and cause them to move to a higher energy level
        • When an electron de-excites a photon is released
      • Fluorescence
        • Atoms absorb UV radiation and excite, when they de-excite they emit visible photons
        • Mercury emits UV photons when colliding with electrons
        • UV absorbed by coating and emit visible photons
        • Very little energy wasted as heat
      • Wave Particle Duality
        • Wave nature seen through diffraction, refraction etc.
        • Particle nature through the photoelectric effect
        • Photons of light pass over all energy, instantly (particle)
        • Matter also has a duality. Electron has wavelength and is a particle
        • de Broglies Wavelength is Planck/massx velocity
        • Electrons can be diffracted like a wave
      • Spectra
        • Spectrum of colors caused by different wavelangths
        • Discrete spectrum shows lines of different colours
        • Every atom has it's own spectrum depending on it's energy levels

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Electric fields resources »