The rest mass of a proton is 1.67 $\times$ 10^-27 kg. From this information one can conclude that the rest energy of a proton is A) 1.50 $\times$ 10^-10 MeV B) 3.13 MeV C) 847 MeV D) 939 MeV E) 742 MeV

Question

Quizplus · Accepted Answer

The rest energy of a particle is given by the famous equation, E=mc^2, where E is the energy, m is the mass, and c is the speed of light. 
Substituting the mass of the proton given in the question, we get E = (1.67 x 10^-27 kg) x (299792458 m/s)^2 = 1.50 x 10^-10 J. 
To convert this to MeV, we use the conversion factor 1 MeV = 1.60 x 10^-13 J. 
Thus, E = (1.50 x 10^-10 J) / (1.60 x 10^-13 J/MeV) = 939 MeV, which is closest to choice D.

The Rest Mass of a Proton Is 1 ×\times× 10-27 Kg ×\times×

The Rest Mass of a Proton Is 1 $\times$ 10^-27 Kg $\times$