Question

$1$ $amu$ (atomic mass unit) mass is equal to energy of

• A. $931 \, \text{keV}$
• B. $93.1 \, \text{eV}$
• C. $931 \, \text{MeV}$
• D. $9.31 \, \text{MeV}$

Answer 1

Answer: (C)

$1amu=1.66\times 10^{- 27}kg$
Equivalent energy can be calculated by using mass-energy equivalence equation
$E=mc^{2}$
$E=1.66\times 10^{- 27}\times \left(3 \times 10^{8}\right)^{2}J$
$1MeV=10^{6}\times 1.6\times 10^{- 19}J$
Using above equations we can get,
$E=931MeV$