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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:

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a

56.8 MeV

b

14.2 MeV

c

28.4 MeV

d

7.1 MeV

answer is D.

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Detailed Solution

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 2He42 Proton +2 Neutron 
∆m =21.0073+1.00874.0015=0.03054 u
 B.E =(0.0305×931.5) MeV=28.41 MeV

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