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Question

Calculate the energy released in MeV in the following nuclear reaction :
21H+21H32He+10n
Assume that the masses of 21H, 32He and neutron (n) respectively are 2.020, 3.0160 and 1.0087 in amu.

A
14.25 MeV
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B
1.425 MeV
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C
142.5 MeV
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D
1425 MeV
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Solution

The correct option is A 14.25 MeV
The mass defect is the difference between the mass of reactants and the mass of products.
Δm=2×m 12Hm 23Hemn=(2×2.020)(3.0160+1.0087)=4.0404.0247=0.0153
The energy released during the nuclear reaction is
ΔE=Δm×931.48MeV=14.25MeV

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