as level physics unit 1 particle physics part d

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as level physics unit 1 particle physics part d
2013-10-01 17:27:20
struggled this

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  1. forces are caused by
    particle exchange
  2. when two particles interact something must happen to let one particle know the other one is there this is the idea behind
    particle exchange
  3. repulsion
    • people = particles 
    • ball = exchange particle 
    • each time the ball is thrown or caught people get pushed apart because the ball carries momentum
  4. attraction
    • people = particles 
    • boomerang = exchange particles 
    • each time then boomerang is thrown or caught people get pushed together
  5. the exchange particles are called
    gauge bosons
  6. the repulsion between two protons is caused by
    the exchange of virtual photons , which are the gauge bosons of the electromagnetic force . gauge bosons are virtual particles - they only exist for a short time
  7. all forces in nature are caused by four fundamental forces . each one has its own
    gauge boson
  8. strong force gauge boson
  9. electromagnetic force gauge boson
  10. weak force gauge bosons
    w+ , w- , z-^0
  11. gravity force gauge bosons
  12. what particles does the strong force affect
  13. what particles do electromagnetic forces affect
    charged particles only
  14. what particles does the weak force affect
    all types
  15. what particles does gravitation affect
    all types
  16. the larger the mass of the gauge boson , the
    shorter the range of the force
  17. the W bosons have a mass of about 100 times that of a proton , which gives the weak force a very
    short range . creating a virtual W particle uses so much energy that it can only exist for a very short time and cant travel very far
  18. the photon has zero mass , which gives you a force with an
    infinite range
  19. beta plus and beta minus decay on a feynman diagram
    • beta - deacy 
    • beta + decay 
  20. electron capture fenyman diagram
    • electrons and protons of course attracted by the electromagnetic interaction between them , but if they collide the weak interaction can make this interaction occur 
  21. positron anti-neutrino collision
    • arrows on the LHS the wrong way btw
  22. neutron-neutrino collision