7. ) Use the semi-empirical formula: E, =C,A-C,A' -C, Z Z-1) _C. (N-Z) A A and the given values for the constants C: = 15.7Mev, C2 = 17.8Mev, Ca = 0.72 Mev, and C. = 23.6 Mev to calculate the binding energy per nucleon for the isobars Cu and 6 Zn [10] (ii). Using the concept of mass defect, compute the binding energy per nucleon for the above nuclei and compare the answer with those in 7(1) above. [10]