Given below are two statements. One is labelled as Assertion (A) and… | JEE Main 2025 (23 Jan, Shift 2)

Q5JEE Main 2025 · 23 JAN · SHIFT 2Easy

Mass Defect & 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:

Show answer and solution

Answer: (a)

Assertion: true. For $30 < A < 170$ , $BE/A$ stays nearly constant at about 8 MeV.
Reason: false. Nuclear force is short range (about 2–3 fm); this short range causes saturation and the constant $BE/A$ .
So the answer is (a).

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Mass Defect & Binding Energy question from JEE Main 2025 (23 Jan, Shift 2)

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