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Theoretical physics.[ref]
https://archives.collections.ed.ac.uk/repositories/2/archival_objects/237297. Independent professional profile
Portrait of Louis de Broglie
. Agence Rol; Bibliothèque nationale de France, département Estampes et photographie, EI-13 (1675), Rol 142233. Commons records public-domain status in France for this historical agency photograph and in the United States for pre-1931 publication; mechanical scan marked PD-scan. Other jurisdictions may differ., via Wikimedia Commons. Source.
Louis de Broglie was a French physicist who is best known for his groundbreaking contributions to quantum theory. Born on August 15, 1892, he introduced the concept of wave-particle duality, which suggests that particles such as electrons exhibit both wave-like and particle-like properties.