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  4. Assertion: Binding energy per nucleon is nearly constant for element in the range A = 30 to A = 170 Reason: The nuclear force between two nucleons falls rapidly to zero as their distance is more than a few femtometres

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Q. Assertion : Binding energy per nucleon is nearly constant for element in the range $A = 30$ to $A = 170$
Reason : The nuclear force between two nucleons falls rapidly to zero as their distance is more than a few femtometres

Nuclei

Solution:

The nuclear force between two nucleons falls rapidly to zero as their distance is more than a few femtometers. This leads to saturation of forces in a medium or a large-sized nucleus, which is the reason for the constancy of the binding energy per nucleon