CBSE 2025 · Region 6 · Set 2 · Q25 · 3 marks
Describe briefly Geiger-Marsden scattering experiment. Depict the graph showing the variation of number of scattered particles detected with the scattering angle. How did this graph lead to the discovery of the nucleus?
Marking-scheme solution
A small fraction of number of incident $\displaystyle \alpha$-particles rebound back. It indicates that the number of $\displaystyle \alpha$-particles undergoing head on collision is very small. From this we conclude that the positive charge is concentrated in a very small volume called nucleus.AtomsAlpha-particle Scattering and Rutherford’s Nuclear Model of AtomUnderstandshort_answermedium
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CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.