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20 Cards in this Set
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 Back
wave speed 
c=fλ c=λ/T 

Amplitude (A) 
displacement from undisturbed position 

Time period (T)

the time to complete one cylce 

Principle of Superposition 
where waves pass though one another unaffected, and where they cross, the total displacement is the vector sum of the individual displacement due to each wave 

Standing waves 
formed when 2 coherent waves, travelling in opposite directions, undergo superposition 

fundamental frequency 
lowest frequency that will form a standing wave 

path difference 
nλ=dsin(θ) at a max 

fringe separation 
d=λ(L/x) 

thin film interference path difference 
approx 2x thickness of film 

Energy (E) 
E=hf 

Speed of light (c) 
3.0x10^8 ms^1 

Quantum Amplitude 
the sum of phasors from all possible paths to a point 

Quantum Probablility 
proportional to (Quantum Amplitude)^2 

Photon/electron equations 
f=eV/k λ=h/mv hf must be equal to or greater than ϕ for removal of electron 

vectors 
have magnitude and direction eg. velocity displacement 

scalars 
have magnitude only eg. speed 

Work done 
W=Fs 

Kinetic energy 
Ek=(1/2)mv^2 

Work done against gravity 
W=mgh 

Power (P) 
P=E/t=W/t=Fv 