CBSE 2026 · Region 1 · Set 2 · Q6 · 1 mark
The distance-of-closest-approach for an alpha particle is 'd' when it moves head-on with speed v towards a target nucleus. If the alpha particle is replaced by a proton moving with the same speed, the new distance-of- closest-approach will be
Official answer
From CBSE’s own marking scheme for this paper.
(A)
2d
NucleiSize of the NucleusApplymcqmedium
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CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.