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Q.

The masses of neutron and proton are 1.0087amu and 1.0073 amu respectively. If the neutrons and protons combine to form helium nucleus of mass 4.0015 amu the binding energy of the helium nucleus will be 

                                                 

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a

  29.4 MeV       

b

   20.8 MeV 

c

 27.3 MeV      

d

   14.MeV

answer is A.

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Detailed Solution

  alpha paritcle He has 2 protons and 2 neutrons and their masses are  242x1.0078 and 2 x1.0087 total mass of 4.033 amu mass defect= 0.0315amu  binding energy=0.0315x931.5 MeV=29.4 MeV

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