Given below are two statements: one is labelled as Assertion (A) and… | JEE Main 2025 (7 Apr, Shift 2)

Q8JEE Main 2025 · 7 APR · SHIFT 2Easy

Nucleus: Composition, Size & Nuclear Force

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): The density of the copper $\left({}_{29}^{64}\text{Cu}\right)$ nucleus is greater than that of the carbon $\left({}_{6}^{12}\text{C}\right)$ nucleus.

Reason (R): The nucleus of mass number A has a radius proportional to $A^{1/3}$ .

In the light of the above statements, choose the most appropriate answer from the options given below:

Show answer and solution

Answer: (c)

$R = R_0 A^{1/3}$ is the correct relation, so R is correct.
It gives $V \propto A$ and mass $\propto A$ , so density is the same for Cu and C.
So A is false.
So the answer is (c) (A) is not correct but (R) is correct.

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Nucleus: Composition, Size & Nuclear Force question from JEE Main 2025 (7 Apr, Shift 2)

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