Practice portal › Nuclei › Mass-Energy and Binding Energy
Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).
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
Asked in JEE Main 23rd Jan 2nd Shift 2025 · Binding energy curve and nuclear force
- (1) (A) is true but (R) is false
- (2) (A) is false but (R) is true
- (3) Both (A) and (R) are true and (R) is the correct explanation of (A)
- (4) Both (A) and (R) true but (R) is not the correct explanation of (A)
Answer: (1) (A) is true but (R) is false
Step-by-step solution
The flat part of the B/A curve (A true) comes from saturation of a short-range force.
Nuclear force is short range: (R) false.
Why the other options are wrong
- (2) Thinks nuclear force is long range.
- (3) Thinks nuclear force is long range.
- (4) Thinks nuclear force is long range.
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