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Person

Louis de Broglie

A portrait depicts a man with gray hair and a mustache, dressed in formal attire, including a black suit and bow tie, set against a warm, neutral background.

French aristocrat and physicist (1892–1987) who in his 1924 doctoral thesis proposed that all matter has a wavelength inversely proportional to its momentum. The hypothesis was speculative enough that his examiners sent it to Einstein, who endorsed it. Electron diffraction experiments confirmed it within three years, and de Broglie received the Nobel Prize in 1929.

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