OSA | Living History

Max Planck earned the 1918 Nobel Prize for Physics for his work describing the flow of energy in discrete packets called quanta.

064

Max Planck

The shift between classical and quantum physics occurred with Max Planck’s discovery that energy flowed in discrete packets he described as quanta.

A quantum of light is called a photon. Planck’s constant, h, determines the amount of energy carried by a photon. (Photo: Wiki Commons)

(Courtesy of Wiki Commons)