The binding energies of nuclei X and Y are E₁ and E₂ respectively. Two atoms of X fuse to give one atom of Y and an energy Q is released. Then:
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The binding energies of nuclei X and Y are E₁ and E₂ respectively. Two atoms of X fuse to give one atom of Y and an energy Q is released. Then:

G1 Physics · Accepted Answer

If E₁ and E₂ are the binding energies of nuclei X and Y, the initial total binding for two X nuclei is 2E₁. After fusion the binding is E₂. The increase in binding energy appears as released energy: Q = E₂ − 2E₁. Correct answer: B.