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Q.

The mass of proton, neutron and helium nucleus are respectively 1.0073U ; 1.0087U and 4.0015U. The binding energy of helium nucleus is

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a

14.2 Mev         

b

28.4 Mev

c

56.8 Mev

d

7.1 Mev

answer is C.

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Detailed Solution

Δm=(2mp+2mn−MHe)=0.0305U

BE=ΔmC2=931×0.0305=28.4 Mev

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