The mass of an electron is 9.11*10^-31 kg. If the de Broglie wavelength for an electron in an hydrogen atom is 3.31*10^-10 m, how fast is the electron moving relative to the speed of light? The speed of light is 3.00*10^8 m/s.(adsbygoogle = window.adsbygoogle || []).push({});

here's what I did: i solved for velocity=6.626*10^-34J/(9.11*10^-31kg)(3.31*10^-10)

v=2.1974*10^-74

and i tried to gain the percent by dividing the speed of light by velocity.

where did i go wrong?

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# Homework Help: The de Broglie wavelength

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