exam questions Flashcards
State what roles exchange particles can play in an interaction.
transfers energy & force
State the particle responsible for beta plus decay
W+
Name the exchange particles which are involved in the strong and weak interactions of the kaon
strong - gluon
weak - W boson
In the photoelectric effect no time delay was observed. Explain how this was used to develop the particle model for the behaviour of light.
→ light travels as photons
→ therefore energy is transferred as discrete packets (1 to 1 interaction)
Explain what happens to the positron produced by pair production.
- will encounter an electron and the two particles will annihilate
- releasing (two high energy/gamma) photons/
Explain the process of pair production.
- photon interacts with orbital electron
- energy of photon used to create particle-antiparticle pair
- to conserve momentum photon needs to interact with interacting particle
what does a K- meson decay into?
- neutral pion
- electron
- electron antineutrino
Describe electron capture.
→ orbital electron
→ interacts with proton in the nucleus (via the weak
interaction)
→ neutron formed
State one difference between an exchange particle and a photon.
exchange particle has rest mass whereas a photon has zero rest mass
Give three similarities between hadrons and leptons.
- all have rest mass
- both interact though weak interaction
- if charged both experience electromagnetic force
