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I know the mass of, for instance, an electron can be express in units of electronvolts over speed of light squared. However, I am not sure how to use it. When I have to calculate [itex]\frac{\sqrt{2mE}}{\hbar}[/itex], do I have to multiply m with the speed of light squared to get it in meters per second squared? Or, divide? Yes, I am a little confused.

PS. Energy is given in electronvolts, and Planck's reduced constant is given in electronvolt seconds.

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# Mass in eV over speed of light

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