as level physics unit 1 particle physics part d

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 Author: ghoran ID: 238210 Filename: as level physics unit 1 particle physics part d Updated: 2013-10-01 17:27:20 Tags: struggled this Folders: Description: revision Show Answers:

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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
gluon
9. electromagnetic force gauge boson
photon
10. weak force gauge bosons
w+ , w- , z-^0
11. gravity force gauge bosons
gravitation
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

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