Summary
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2.1 In classical physics, matter (including electrons) was described as particles by Newtonian mechanics, while light was described as waves, consistent with phenomena such as interference and diffraction of light.
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2.2 Phenomena such as blackbody radiation and the photoelectric effect forced Planck and Einstein to introduce a particle aspect to light (photons). Analysis of atomic spectra then led Bohr and de Broglie to analogously introduce a wave aspect to subatomic particles such as electrons. This led to a wave–particle duality and a quantum mechanical description of nature by Heisenberg and Schrödinger.
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2.3 To understand how electrons move in semiconductor devices or interact with light, we need to determine a complex wavefunction ...
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