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How does the binding energy per nucleon vary with the increase in the number of nucleons?

1. Increases continuously with mass number
2. Decreases continuously with mass number
3. First decreases and then increases with increase in mass number
4. First increases and then decreases with increase in mass number

Correct answer: First increases and then decreases with increase in mass number

Solution

The binding energy per nucleon first increases with mass number, reaching a peak around iron (Fe), and then decreases for heavier nuclei due to the dominance of repulsive forces over the attractive nuclear forces.

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