1.

The masses of neutron and proton are 1.0087 a.m.u. and 1.0073  a.m.u. respectively. If the neutrons and protons combine to form a helium nucleus (alpha particles) of mass 4.0015 a.m.u. The binding energy of the helium nucleus will be (1 a.m.u.= 931MeV) [CPMT 1986; MP PMT 1995; CBSE PMT 2003]

A.            28.4 MeV                               
B.            20.8 MeV
C.            27.3 MeV                               
D.            14.2 MeV
Answer» B.            20.8 MeV


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