Correct option is: (ii) 931 Mev
• Atomic mass unit: It is a dalton or unified atomic mass unit defined as (amu) which is equal to 1/12 of the mass of an atom of a carbon -12 atom.
1 amu = 931 MeV
CALCULATION:
On applying Einstein's mass-energy
\(E = mc^2\)
Where E is energy, m is mass and c is the speed of light
\(1 \ amu = 1.66 \times 10^{-27} kg\), speed of light (c) = \(3 \times 10^8 ms^{-1}\)
\(E = 1.66 \times 10^{-23} \times ( 3 \times 10^{-8})^2 = 14.94 \times 10^{-11}J\)
On converting the Energy into ev we have to divide the whole quantity by \(1.6 \times 10^{-19}\) we get
\(\frac{14.94 \times 10^{-11}}{1.6 \times 10^{-19}} = 931 Mev\) (1 mega meter \(= 10^6m\))
• Hence, 1 amu has energy equal to 931 Mev.
