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Question

A nucleus AZX has mass represented by m(A,Z). If mp and mn denote the mass of proton and neutron respectively and BE the binding energy(in MeV) then.

A
BE=[m(A1Z)Zmp(AZ)mn]C2
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B
BE=[Zmp+(AZ)mnm(A,Z)]C2
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C
BE=[Zmp+Amnm(A,Z)]C2
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D
BE=m(A1Z)Zmp(AZ)mN
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Solution

The correct option is B BE=[Zmp+(AZ)mnm(A,Z)]C2
In the case of formation of nucleus the evolution of energy equals to the binding energy of the nucleus takes place due to disappearance of a fraction of total mass. If the quantity of mass disappearing is Δm, then the binding energy is
BE=Δmc2
From the above discussion, it is clear that the mass of nucleus must be less than the sum of the masses of the constituent neutrons and protons. We can then write
Δm=ZmpNmnm(A,Z)
where m(A,Z) is the mass of the atom of mass number A atomic number Z. Hence, the binding energy of nucleus is
BE=[Zmp+Nmnm(A,Z)]c2
BE=[Zmp+(AZ)mnm(A,Z)]c2.

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