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What is the de Broglie wavelength of a 5.0-eV electron?

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E=5eV=8•10⁻¹⁹ J
λ=h/p = h/sqrt(2mE) =
=6.63•10⁻³⁴/sqrt(2•9.1•10⁻³¹•8•10⁻¹⁹)=5.5•10⁻¹⁰ m

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