Question
The mass of a 
nucleus is 0.042u less than the sum of the masses of all its nucleons. The binding energy per nucleon is 
nucleus is nearly
-
46 MeV
-
5.6 MeV
-
3.9 MeV
-
23 MeV
Solution
B.
5.6 MeV
If, m = 1 u, c= 3 x 108 ms-1, then
E = 931 MeV i.e. 1 u = 931 MeV
Binding energy = 0.042 x 931 = 39.10 MeV
therefore, Binding energy per nucleon
= 39.10/7 = 5.58 = 5.6 MeV
