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Quantum Physics Complete Guide
Quantum Physics Complete Guide 
Photon Particle of light 
Intensity + Formula Power per unit area 
I = P/A 
Units: W/m² 
The Photoelectric Effect The emmision of electrons from a metal when electromagnetic radiation of 
high enough frequency falls on the surface. 
Threshold Frequency (f₀) Minimum frequency of light needed to eject electrons fromt he surface of 
the metal 
Classical Theory Light acts as a wave and the energy of a wave depends on its amplitude (intensity) 
not its fre...