Quote: consider reflection of a beam of electrons at a grating; if we know where an electron hits, its velocity must be so high that its de Broglie wavelength is much smaller than the grating, yielding classical reflection

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let the reflection of a beam of electrons … of the de Broglie wavelength of the electrons, … classical theory gives is grossly and macroscopically different. … with a classical theory. We might if we … the reflection there violates classical theory. However, when … what point on a grating ruling it hits, … of the electron becomes so much shorter that … laws of the quantum theory.   Google-1   Google-2

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Topic: quantum electrodynamics (34 items)