An electron has a rest mass of 0.511 MeV.From this information one can conclude that the rest mass of an electron is A)9.08 $\times$ 10 ^-31 kg B)8.82 $\times$ 10 ^-14 kg C)2.94 $\times$ ^-22 kg D)5.68 $\times$ 10 ^-12 kg E)None of these is correct.

Question

Quizplus · Accepted Answer

The rest mass of an electron is given as 0.511 MeV. 
Using the conversion factor, 1 MeV/c^2 = 1.78 x 10^-30 kg, we can convert the rest mass from MeV to kg. 
0.511 MeV * (1.78 x 10^-30 kg/MeV) = 9.08 x 10^-31 kg. 
Therefore, the best choice for the rest mass of an electron is A) 9.08 x 10^-31 kg.

An Electron Has a Rest Mass of 0 ×\times× 10 -31 Kg B)8

An Electron Has a Rest Mass of 0 $\times$ 10 ^-31 Kg
B)8