Given, mass of 1429Si=28.976495u Now, mass of 14 protons =14× mass of 1 proton =14×1.007276=14.101864u Also, mass of 29−14=15 neutrons =15× mass of 1 neutron =15×1.008664=15.12996 Total mass of constituents of Si atom
=14.101864+15.12996=29.231824
So, mass defect = mass of constituents − mass of atom
=29.231824−28.976495=0.255329u
Binding energy = Energy equivalent of mass defect =∆M×931.5MeV =0.255329×931.5=237.84MeV