# The mass of an electron is 9.11times 10^{-31}~rm kg. If the de Broglie wavelength for an...

###### Question:

The mass of an electron is 9.11times 10^{-31}~rm kg. If the de Broglie wavelength for an electron in a hydrogen atom is 3.31times 10^{-10}~rm m, how fast is theelectron moving relative to the speed of light? The speed of light is 3.00times10^8 ~rm m/s.

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