(a) What is the nuclear binding energy B(2AX)? (5 points) (b) Sketch the average binding energy per nucleon B/A vs A (5 points) and explain the five main features of the curve ( 15 points). (c) Does larger average binding energy per nucleon B/A nuggent higher or lower nuclear stability? (5 points) (d) What are the five major contributions to the binding energy B/A, Le, the semi-empirical mass formula? (no need to write down the mathematical expression) (10 points)