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Physics · 2024 · 2 marks
CBSE 2024 · Region 2 · Set 3 · Q26
(a) Briefly discuss three characteristics of the forces between nucleons. (b) Which out of _4^8 X and _3^5 Y nuclei is more stable and why?
(a)
Briefly discuss three characteristics of the forces between nucleons.
(b)
Which out of $\displaystyle { }_{4}^{8} \mathrm{X}$ and $\displaystyle { }_{3}^{5} \mathrm{Y}$ nuclei is more stable and why?
Marking-scheme solution
(a)
Characteristics of nuclear forces:
1. Saturated in nature.
2. Attractive for distances larger than $\displaystyle r_{0}$ and repulsive for distances less than $\displaystyle r_{0}$.
3. Do not depend on the nature of electric charge, i.e. same for n-n, n-p and p-p pairs.
4. Much stronger than gravitational forces.
(b)
$\displaystyle { }_{4}^{8} \mathrm{X}$ is more stable.
The ratio of the number of neutrons to the number of protons is more in $\displaystyle { }_{4}^{8} \mathrm{X}$ than $\displaystyle { }_{3}^{5} \mathrm{Y}$.
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CBSE Class 12 Physics past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.