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899406
AS Physics Unit 1
Description
Mind Map on AS Physics Unit 1, created by bainoable on 19/05/2014.
Mind Map by
bainoable
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Resource summary
AS Physics Unit 1
Particles and Radiation
Atomic Structure
Baryon- 3 Quarks
Meson-Quark antiquark pair
Leptons- Fundamental
Stable and Unstable Nuclei
Beta+ Decay
Loses a Proton
Beta- Decay
Gains a Proton
Alpha Decay
Loses a Helium Nucleus
Particle Classification
Hadrons
Baryons
Mesons
Leptons
Exchange Particles
Electromagnetic Photon
Weak Force W Boson
Feynman Diagrams
Beta Plus Decay
Beta minus Decay
Electron Capture
Quantum Phenomena
Photoelectric Effect
Light of a certain frequency or higher can start the photoelectric effect
Photoelectric effect is where electrons are ejected from a metals surface
Work Function is the required energy to start the effect
Threshhold Frequency is where the energy of the light is equal to or greater than the work function
Energy Levels
Excitation
Where an electron on an atom moves up a shell, further from the nucleus
Happens when a photon or electron of the precise energy of the shell difference strikes the electron
Becomes De-excited when the atom returns to its ground state. This releases a photon
Ionisation
When an electron is struck clean out of the atom
Current Electricity
Definitions
Current is the rate of flow of charge
Pd is the energy per unit charge
Resistance is a measure of how difficult it is for current to flow
Equations
Q=IT
V=W/Q
V=IR
P=VI
(Look up line shapes for components on a V/I Graph)
Circuits
Parallel
Pd(in)=Pd(out)
1//R(total))=1/R1+1/R2...+1/Rn
Series
Pd Split between Components
R(total)= Sum of all resistors
Pd(in)=Pd(out)
Facts
Ohmic Conductor= Constant resistance
Potential dividers use resistors to get required Pd to components
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