1860 The distribution of so-called black-body radiation fails to match predictions made by theoretical models.
1870s Austrian physicist Ludwig Boltzmann’s analysis of entropy (disorder) introduces a probabilistic interpretation of quantum mechanics.
1905 Albert Einstein proposes that the quantum is a real entity, using Planck’s concept of quantized light to introduce the idea of the photon.
1924 Louis de Broglie proves that matter behaves both as a particle and as a wave.
1926 Erwin Schrödinger formulates an equation for the wave behavior of particles.
In December 1900, the German theoretical physicist Max Planck ...