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Electron Velocity Problem

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Find the velocity an electron in a circular orbit would require at a distance of 2.098 Angstroms from a proton. Find the deBroglie wavelength of this electron. Determine whether the corresponding probability wave would 'fit' the circumference of the orbit without undergoing destructive interference. [ The mass of an electron is 9.11 * 10^-31 kg; the proton has a much greater mass; Planck's Constant is 6.62 * 10^-34 J s; k = 9 * 10^9 N m^2 / C^2 ]

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