Directional Momentum Assigned to Light Quanta
Einstein's radiation arguments associated localized quanta with directed momentum as well as energy, moving the light-quantum concept closer to the later photon picture.
Albert Einstein · Place
4 Einstein records associated with Salzburg.

Einstein's radiation arguments associated localized quanta with directed momentum as well as energy, moving the light-quantum concept closer to the later photon picture.
At the Salzburg meeting Einstein presented radiation as a problem requiring both electromagnetic waves and quantum-like localized events, highlighting a central unresolved issue of early quantum theory.
Presents a major lecture arguing that radiation displays both wave-like and particle-like properties.
Einstein argued that a future theory of light would need to combine wave structure with localized quantum structure instead of choosing only one classical description.