Engineering
Physics
Nucleus and Nuclear Force
Question

The nuclear reaction 1H2 + 1H2 → 2He4 (mass of deuteron = 2.0141 amu and of He = 4.0024 amu) is

fusion reaction releasing 24 MeV energy
fusion reaction absorbing 24 MeV energy
fission reaction releasing 0.0258 MeV energy
fission reaction absorbing 0.0258 MeV energy
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Solution

 1H2 H2 →  2He4 + Q.

Given.
mass of, 1H2 = 2.0141amu
mass of 2He4 = 4.0024amu

 Q. Value = ( mass of reactant  mass of product)c2

2 × mass of 1H2  mass of 2He4c2

= (2 × 2.0141 – 4.0024) × 931meV

= (4.0282 – 4.0024) × 931meV

= 0.0258 × 931mev

≅ 24meV

Fusion reaction releasing energy = 24MeV