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Q.

The binding energy per nucleon in deuterium and helium nuclei are 1.1 MeV and 7.0 MeV, respectively. When two deuterium nuclei fuse to form a helium nucleus, the energy released in the fusion is

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a

30.2 MeV

b

 28.0 MeV 

c

23.6 MeV

d

2.2 MeV

answer is B.

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Detailed Solution

Binding energy of two H2 nuclei 

= 2(1.1 x 2) = 4.4 MeV.

 Binding energy of one  He4 nucelus  

=4×7.0=28MeV

:. Energy released  =28−4.4=23.6 MeV

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