Chemistry / Chem 0810 · Atom · ~20 seconds
De Broglie: Wave-Particle Duality of Matter
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In 1925, Louis de Broglie proposed every moving particle, not only light, has an associated wavelength, extending wave-particle duality to matter.
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An electron beam diffracts through a crystal lattice the way light diffracts through slits, evidence confirming de Broglie's matter-wave proposal.
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De Broglie's matter wavelength matters only for very light, fast particles like electrons — a thrown ball's wavelength is negligible.