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1) The document discusses the dual nature of matter and light, explaining that light has both wave-like and particle-like properties, as demonstrated through the photoelectric effect.
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2) De Broglie's hypothesis that matter has wave-like properties described by the de Broglie wavelength.
3) Daviesson and Germer's experiment demonstrating the wave-like diffraction of electrons from a crystal lattice, verifying matter waves.Atomic structure ppt
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