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Question

The binding energy of deuteron (21H) is 1.15 MeV per nucleon and an alpha particle (42He) has a binding energy of 7.1 MeV per nucleon. Then in the reaction

21H+21H42He+Q

the energy Q released is approximately


A

1 MeV

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B

11.9 MeV

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C

23.8 MeV

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D

931 MeV

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Solution

The correct option is C

23.8 MeV


Binding energy of 21H=1.15× number of nucelons = 1.15×2=2.3 MeV.

Total binding energy of reactants = 2.3 + 2.3 = 4.6 MeV.

Binding energy of 42He=7.1× number of nucleons =7.1×4=28.4MeV.

Therefore , Q= 28.4 - 4.6 = 23.8 MeV.


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