Planck's hypothesis of 1900 about the main features of light was very badly received by the scientific community because it was breaking all the precepts of classical physics. It was not accepted until, in 1905, Einstein used it to explain an unexplained phenomenon "the photoelectric effect" described by Hertz in 1887.
This mentioned "photoelectric effect" goes about electron emission of a metal when it's irradiated with electromagnetic radiation. However, not all electromagnetic radiations works, I mean, it has to be an specific type one, for example, it has to display a determinated frequency, and a minimum energy called " threshold frequency ". If the energy of the way does not reach this amount of energy, no electrons will be emitted.
The Albert Einstein's equation is the next one:
Where E=hxv ( energy of a quark), and E=hxv0 (where v0 it's the threshold frequency). So,
E0 + Ke(Kinetic Energy of the electron) = Ef( Final Energy).
Also this formula was so outstanding by the fact of new concept of quarks, as I mention before.
The concept of quarks was firstly introduced by Planck. But time later, Einstein tended to called fotons, those particles which forms the light itself.
Here I attach you a link in order to improve your knowledge about Einstein's history, one of the most important scientific in the world:
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