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To find the speed of an electron with a wavelength of 0.1nm, you can use the de Broglie wavelength formula: λ = h / mv, where λ = wavelength, h = Planck's constant, m = mass of electron, and v = speed of electron. Rearranging the formula to solve for v, we get v = h / (mλ). Plugging in the values (h = 6.63 x 10^-34 J·s, m = 9.11 x 10^-31 kg, and λ = 0.1 x 10^-9 m), you can calculate the speed.

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