Question

One atomic mass unit (a.m.u) is equal to :

• A. 1 eV of energy
• B. 931 eV of energy
• C. 1 MeV of energy
• D. 931 MeV of energy

Answer 1

The correct option is D 931 MeV of energy

$E=m{C}^2;m=1.66\times {10}^{-27}kg;C=3.8\times {10}^{8}m/s$
$E=1.66\times {10}^{-27}\times (3.8\times {10}^8{)}^2$
$E=1.49\times {10}^{-10}J$ $1MeV=1.6\times {10}^{-13}J$
$E=931.25\simeq 931MeV$
hence,option D is correct.