Discussion
If the binding energy per nucleon of a nucleus is 8.75 MeV and its mass number is 56, then total binding energy is
Answer: C
The total binding energy is 490 MeV.
Binding energy per nucleon is the total binding energy divided by the mass number, so multiply back.
\[ BE = 8.75 \times 56 = 490\ \text{MeV} \]
56 MeV is just the mass number, 8 MeV is roughly the per-nucleon value, and 504 MeV would be 9 MeV per nucleon. A nucleus with A = 56 is iron-56, close to the peak of the binding energy curve.
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