(A) : The nuclear force between two nucleons falls rapidly to zero as their distance is more than a few femtometer.
(R) : Sharp decrease in nuclear forces made it saturated, which causes constancy for binding energy per nucleon.

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(A) is true but (R) is false

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

Both (A) and (R) are true and (R) is not the correct explanation of (A)

answer is A.

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Detailed Solution

As soon as two nucleons are separated by more than a few femtometers, the nuclear force between them quickly vanishes. The constant binding energy per nucleon results from the saturation of forces in a medium or large-sized nucleus as a result of this.

Both (A) and (R) are true and (R) is the correct explanation of (A).

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