Question

$1$ a.m.u. in terms of energy is :

• A. 93.1 V
• B. 931 eV
• C. 9.31 MeV
• D. 931 MeV

Answer 1

Answer: (D)

According to Einstein's mass energy equivalence, $E = mc ^{2}$ where $c =$ velocity of light.
So, $E =1.66 \times 10^{-27} \times\left(3 \times 10^{8}\right)^{2}=14.94 \times 10^{-11} J$
$E =\frac{14.94 \times 10^{-11}}{1.6 \times 10^{-19}} eV \quad$ where $1 eV =1.6 \times 10^{-19} J$
$E =931 \times 10^{6} eV =931 MeV$