Physics was the prize area which Alfred Nobel mentioned first in his will. At that time, in the end of the nineteenth century, many people viewed physics as the foremost of the sciences, and perhaps Nobel saw it this way as well. His own research was also closely tied to physics. The Nobel Prize in Physics is awarded by the Royal Swedish Academy of Sciences.
The Nobel Prize in Physics 1921 was awarded to Albert Einstein "for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect".
The discoveries of Max Planck in 1900 contributed absolutely in Einstein’s photoelectric effect theory. Then, this discovery changed the classic physic and also the univers vision. However, the prize didn’t arrive until 1922.