posted by K .
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.
c= 3.00*10^8 m/s