The binding energies per nucleon for a deuteron and an α-particles are X1 and X2 respectively, then the free energy Q released in the fusion reaction, \(_{1}^{2} \mathrm{H}+_{1}^{2} \mathrm{H} \longrightarrow_{2}^{4} \mathrm{He}+Q\), is :
A. 4 (X1 + X2)
B. 4 (X1 – X2)
C. 2 (X1 + X2)
D. 2 (X2 – X1)
Answer:B
The binding energies per nucleon for a deuteron and an α-particles are X1 and X2 respectively, then the free energy Q released in the fusion reaction, \(_{1}^{2} \mathrm{H}+_{1}^{2} \mathrm{H} \longrightarrow_{2}^{4} \mathrm{He}+Q\), is :
A. 4 (X1 + X2) B. 4 (X1 – X2) C. 2 (X1 + X2) D. 2 (X2 – X1)