1. (a) Write and discuss the Weizsächer semi-empirical binding-energy Formula that contains three contributing energies and two correction energies. Derive semi-empirical mass formula from the binding-energy Formula. (b) What are the achievements and failures of the liquid drop model. 2. Analyze the similarity between the variation of ionization energies for various atoms with Z and the proton/neutron separation energies of different nuclides with nucleon number using the corresponding graphs.

1. (a) Write and discuss the Weizsächer semi-empirical binding-energy Formula that contains three contributing energies and two correction energies. Derive semi-empirical mass formula from the binding-energy Formula. (b) What are the achievements and failures of the liquid drop model. 2. Analyze the similarity between the variation of ionization energies for various atoms with Z and the proton/neutron separation energies of different nuclides with nucleon number using the corresponding graphs.

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56 Fe is among the most tightly bound of all nuclides. Itis more than 90% of natural iron. Note that 56 Fe has evennumbers of both protons and neutrons. Calculate BE/A , thebinding energy per nucleon, for 56 Fe and compare it withthe approximate value obtained from the graph