Ques. 1JEE Main 2025, 23 January (Evening Shift)
Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the correct answer from the options given below :
- (A) is true but (R) is false
- Both (A) and (R) are true and (R) is the correct explanation of (A)
- (A) is false but (R) is true
- Both (A) and (R) are true but (R) is NOT the correct explanation of (A)
Answer
(1) (A) is true but (R) is false
Solution
From the curve, for 30<A<170 the binding energy per nucleon is almost constant ( 8 MeV): (A) is true.
[figure]
This is because the nuclear force is short range (about 1 to 3 fm): each nucleon feels only its neighbours. So (R) is false.
Answer: (1)