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The binding energies of nuclei \( \mathrm{X} \) and \( \mathrm{Y} \) are \( \mathrm{E}_{1} \) and \( \mathrm{E}_{2} \) respectively. Two atoms of \( \mathrm{X} \) fuse to give one atom of \( \mathrm{Y} \) and an energy \( \mathrm{Q} \) is released. Then:
(A) \( \mathrm{Q}=2 \mathrm{E}_{1}-\mathrm{E}_{2} \)
(B) \( Q=E_{2}-2 E_{1} \)
(C) \( Q=2 E_{1}+E_{2} \)
(D) \( \mathrm{Q}=2 \mathrm{E}_{2}+\mathrm{E}_{1} \)
\( \mathrm{P} \)
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