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› II_1515 The Vector Potential - The Feynman Lectures on Physics You remember that instead of particle motions, one deals with probability amplitudes which vary in space and time. In these amplitudes there are wavelengths related to momenta, and frequencies related to energies. The momenta and energies, which determine the phases of wave functions, are therefore the important quantities in quantum mechanics. en.wikipedia.org › wiki › Augustin-Jean_FresnelAugustin-Jean Fresnel - Wikipedia Augustin-Jean Fresnel (/ ˈ f r eɪ n ɛ l,-n əl / FRAY-nel, -⁠nəl; / ˈ f r ɛ n ɛ l,-əl / FREN-el, -⁠əl; or / f r eɪ ˈ n ɛ l / fray-NEL; French: [oɡystɛ̃ ʒɑ̃ fʁɛnɛl]; 10 May 1788 – 14 July 1827) was a French civil engineer and physicist whose research in optics led to the almost unanimous acceptance of the wave theory of light, excluding any remnant of Newton's ... recordstoreday.com › SpecialReleasesSpecialReleases | RECORD STORE DAY Record Store Day was conceived in 2007 at a gathering...