Q: Find the binding energy of (26Fe56) Atomic mass of Fe is 55.9349 u and that of hydrogen is 1.00783 u and
mass of neutron is 1.00876 u.
Sol: Mass of he hydrogen atom mH = 1.00783 u;
Mass of neutron mn = 1.00867 u;
Atomic number of iron , Z = 26; mass number of iron A = 56 ;
Mass of iron atom Ma = 55.9349 u
Mass defect , Δm = [Z mH + (A-Z) mn ] – Ma
= [26 x 1.00783 +(56-20)1.00867]-55.93493 u = 0.5287 u.
Binding energy = (Δm)c2 = (0.5287)(931.5 MeV) MeV
= 492.55 MeV.