The binding energy per nucleon decreases with increase in mass number for heavy nuclei like 235U. These nuclei contain a large number of protons which repel one another. As a result of this repulsive force value of B.E. per nucleon decreases with increase in mass number and suchheavier nuclides are unstable.
Class 12 Physics Chapter 13 Nuclei Session 2024-2025.
State two characteristics of nuclear force. Why does the binding energy per nucleon decrease with increase in mass number for heavy nuclei like U?
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Two characteristics of nuclear force are:
(i) It is attractive at short ranges (about 1-2 femtometers).
(ii) It is independent of charge and acts equally on protons and neutrons.
The binding energy per nucleon decreases for heavy nuclei like Uranium because the nuclear force becomes less effective over larger distances, while the repulsive electrostatic force between protons increases.
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