Posted by **K** on Sunday, November 4, 2007 at 1:46pm.

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

Express your answer numerically as a percentage of the speed of light.

How should this question be worked?

I tried: 0.692% already but it was incorrect.

m=9.11*10^-31 kg

lambda=3.31*10^-10 m

c= 3.00*10^8 m/s

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