QUANTUM THEORY

Einstein covered something in his research called the photoelectric effect. with this photo effect he came to the conclusion that electrons are passed some metal of sort and do this by way of light.einstein then proposed something called "the Quantum Theory" which then made Plank's early theory more lucid. after this einstein then recieved a Noble prize for physics in 1921 and then in 1922 he recieved another noble price for his work with the "photoelectric effect." at this point there were two theory's of light and no physicist knew which one to choose was correct.