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9 June, 1905: Einstein's seminal article on the photoelectric effect, received by "Annalen der Physik" March 18, was published.
The article proposed the idea of light quanta, extending Planck's quanta to light itself.⚛️🔭🧪
onlinelibrary.wiley.com/doi/abs/10.1...
#histsci #science #physics
