Light has a particle nature. This is most clearly shown by the photoelectric effect.
Particles have a wave nature. All of the wave phenomena we have seen apply to
particles as well.
Quantum principles are well understood and well accepted.
The photon model
E (in eV) = λ(¿nm)
λ (in nm) =
The Photoelectric Effect
There is a threshold frequency.
Above it, electrons are emitted.
Not below it
Changing the accelerating voltage changes the current, but only within certain limits
The Work Function
How much it “costs” to release an electron
This varies with the electrode
Diffraction and Interference
Destructive interference occurs where a crest overlaps a trough
Constructive interference occurs where two crests overlap
Double Slit Interf