Unit 1 Flashcards
Strong Force only affects what classification of particle?
Hadrons
What is Pair Production?
When a gamma ray photon has enough energy to produce enough mass to form a particle-antiparticle pair.
(Usually and electron-positron pair)
What is meant by an Excited atom?
An electron is at a higher level that ground state
What is the quark structure of a meson?
Quark-Antiquark pair
Which is the only stable Baryon?
The Proton
What does a neutron decay into? (Beta-plus decay)
Proton —> Neutron + Positron + Electron-neutrino
What is the quark composition of a Proton?
UUD
What is the quark composition of a Neutron?
UDD
Describe the process to get visible light from a fluorescent tube
Fluorescent tubes contain mercury vapour and when an electric current flows through the tube electrons collide with mercury atoms raising the electrons to a higher state in the mercury atom. When this electron returns to it’s regular state there is a photon emitted. However these photons are in the ULTRA VIOLET spectrum so a coating on the tube absorbs the photon and emits another photon with less energy so a shorter wavelength and in the visible light spectrum.
What is Annihilation?
When a particle and it’s antiparticle meet and their mass’ are converted back to energy. The formation of 2 photons.
Everything decays under what interaction?
Weak Interaction
Beta-plus decay?
Proton —> Neutron + Positron + Electron-neutrino
What 4 properties must be conserved in particle interactions?
Charge
Baryon number
Strangeness
Lepton number
Beta-minus decay?
Neutron —> Proton + Electron + Anti-Electron-neutrino
When a neutron decays into a proton what quark changes?
D —> U
In a PARALLEL circuit, what happens to current and voltage?
Current splits at each branch and voltage is the same across each branch
In a SERIES circuit what happens to current and voltage?
Current is the same and voltage splits between each component
What is EMF?
Electromotive force - the amount of electrical a battery produces
How can we work out the average of an AC Current?
Root Mean Square current.
Divide the peak current by the square root of 2
What is the exchange particle for the Strong Force and what particles are affected by this interaction?
Exchange particle = gluon (glue is strong??)
It affects Hadrons only.
What is the exchange particle for the Weak Force and what particles are affected by this interaction?
Exchange particle = W Boson (W for weak)
All particles are affected so most interactions are under weak interaction
What is the exchange particle for the Electromagnetic Force and what particles are affected by this interaction?
Exchange particle = photon (electromagnetic spectrum = light = photon??)
This only affects charged particles
