Question 134: Atoms & Nuclei

Question

Given below are two statements: one is labelled as Assertion $\mathbf{A}$ and the other is labelled as Reason $\mathbf{R}$
Assertion A : The binding energy per nucleon is practically independent of the atomic number for nuclei of mass number in the range 30 to 170 .
Reason R : Nuclear force is short ranged.
In the light of the above statements, choose the correct answer from the options given below

Accepted Answer

The statement about the binding energy per nucleon is true, and is known as the semi-empirical mass formula. According to this formula, the binding energy per nucleon for nuclei in the range of mass numbers 30 to 170 is nearly constant, with a maximum value around mass number 60.
The statement about nuclear force being short ranged is also true. The strong nuclear force that binds nucleons together is a short-range force that acts only over distances of a few femtometers.
Therefore, both Assertion A and Reason R are true, and Reason R provides a valid explanation for Assertion A. The correct answer is:
So, Both Assertion A and Reason R are true, and Reason R is the correct explanation for Assertion A.

Answer

$\mathrm{A}$ is false but $\mathbf{R}$ is true

Answer

$\mathrm{A}$ is true but $\mathbf{R}$ is false

Answer

Both $\mathbf{A}$ and $\mathbf{R}$ are true and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$

Answer

Both $\mathbf{A}$ and $\mathbf{R}$ are true but $\mathbf{R}$ is NOT the correct explanation of $\mathbf{A}$

Atoms & Nuclei

Choose the correct answer: