= Louis de Broglie
{c}
{tag=Physicist}
{title2=1892-1987}
{wiki}
<Louis de Broglie> proposed associating a <wave> with material particles, relating its <wavelength> to the particle <momentum> by $\lambda=h/p$. This connects a particle quantity with an experimentally testable wave scale: increasing the <momentum> decreases the expected <diffraction> wavelength. His account of <matter waves> helped motivate a description in which standing-wave conditions select allowed atomic motions, and his Nobel lecture discusses the relation between this proposal and later electron-diffraction experiments.<Nobel Lectures, Physics 1922–1941/The Wave Nature of the Electron by Louis de Broglie>[1929 Nobel lecture, matter-wave wavelength and electron diffraction]{ref}
Theoretical physics.https://archives.collections.ed.ac.uk/repositories/2/archival_objects/237297[Independent professional profile]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Prince%20Louis-Victor%20de%20Broglie.jpg?width=250]
{title=Portrait of <Louis de Broglie>}
{description=Agence Rol; Bibliothèque nationale de France, département Estampes et photographie, EI-13 (1675), Rol 142233. https://commons.wikimedia.org/wiki/File:Prince_Louis-Victor_de_Broglie.jpg#Licensing[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=https://commons.wikimedia.org/wiki/File:Prince_Louis-Victor_de_Broglie.jpg}
{width=250}
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