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The following 2 entries include the term de Broglie.
de Broglie equation
noun: an equation in physics: the de Broglie wavelength of a moving particle is equal to the Planck constant divided by the momentum of the particle
de Broglie wave
noun: the hypothetical wave train that in wave-mechanical theory corresponds to a moving elementary particle (as an electron or proton), moves with it, and gives the particle certain wave properties (as interference and diffraction)
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Merriam-Webster unabridged
