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Solution


Q.

The mass of proton, neutron and helium nucleus are respectively 1.0073 u, 1.0087 u and 4.0015 u. The binding energy of helium nucleus is          [2023]
1 14.2 MeV  
2 28.4 MeV  
3 56.8 MeV  
4 7.1 MeV  

Ans.

(2)

B.E. of Helium=(2mp+2mN-mHe)c2=28.4 MeV