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Solution


Q.

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).                   [2025]

Assertion (A): The binding energy per nucleon is found to be practically independent of the atomic number A, for nuclei with mass numbers between 30 and 170.

Reason (R): Nuclear force is long range.

In the light of the above statements, choose the correct answer from the options given below:
1 (A) is false but (R) is true  
2 (A) is true but (R) is false  
3 Both (A) and (R) are true and (R) is the correct explanation of (A)  
4 Both (A) and (R) are true but (R) is NOT the correct explanation of (A)  

Ans.

(2)

From graph between B.E/N and A we can see BE/N is almost constant ⇒ correct

Reason ⇒ incorrect as nuclear forces are short range forces.