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Physics · 2024 · 3 marks
CBSE 2024 · Region 2 · Set 2 · Q27
(a) Plot a graph depicting potential energy of a pair of nucleons in a nucleus as a function of their separation. (b) Identify the regions where the…
(a)
Plot a graph depicting potential energy of a pair of nucleons in a nucleus as a function of their separation.
(b)
Identify the regions where the nuclear force is (i) attractive, and
(ii)
repulsive. Justify your answer.
Marking-scheme solution
(b)
$\displaystyle F=-\frac{d U}{d x}$
(i)
For distance larger than $\displaystyle r_{0}$, force is attractive.
Since the slope of the curve is positive.
(ii)
For distance less than $\displaystyle r_{0}$, force is repulsive.
Since the slope of the curve is negative.
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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.