How do you find the rest mass (kg) of a 3.1 eV electron?

Explanation:

The rest energy of any substance is defined by the Einstein's mass energy equivalence relation. Thus the rest mass of a electron is 9.11x10^-31 kg. The speed of light is 299,792,458 m/s. Thus multiplying the square of speed of light with the rest mass of electron gives the rest energy of the electron.

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explanation:

wind is defined by the direction it blows from.   for example, a wind blowing from north to south is called a northerly wind.