This day physicist Max Planck presented his report on the law of energy distribution in the normal spectrum. Later he wrote that he did not think about establishing a new field of science, he simply wanted to study the black body radiation in more detail. But it turned out that during that research a new field of science emerged. Planck supposed that while radiating or absorbing the energy is released in portions that he called quanta. Planck’s quantum theory was truly revolutionary in physics – now classical physics is referred to as “pre-Planck physics” as opposed to the contemporary state of the science.
In 1900, Max Planck quantum theory was born