CBSE 2022 · Region 1 · Set 1 · Q2 · 2 marks
Draw the graph showing the variation of the number (N) of scattered alpha particles with scattering angle ( $\displaystyle \theta$ ) in Geiger - Marsden experiment. Infer two conclusions from the graph.Plot suitable graphs to show the variation of photoelectric current with the collector plate potential for the incident radiation of(i)the same intensity but different frequencies $\displaystyle v_{1}, v_{2}$ and $\displaystyle v_{3}\left(v_{1}<v_{2}<v_{3}\right)$(ii)the same frequency but different intensities $\displaystyle \mathrm{I}_{1}, \mathrm{I}_{2}$ and $\displaystyle \mathrm{I}_{3}\left(\mathrm{I}_{1}<\mathrm{I}_{2}<\mathrm{I}_{3}\right)$
Draw the graph showing the variation of the number (N) of scattered alpha particles with scattering angle ( $\displaystyle \theta$ ) in Geiger - Marsden experiment. Infer two conclusions from the graph.
Plot suitable graphs to show the variation of photoelectric current with the collector plate potential for the incident radiation of
(i)
the same intensity but different frequencies $\displaystyle v_{1}, v_{2}$ and $\displaystyle v_{3}\left(v_{1}<v_{2}<v_{3}\right)$
(ii)
the same frequency but different intensities $\displaystyle \mathrm{I}_{1}, \mathrm{I}_{2}$ and $\displaystyle \mathrm{I}_{3}\left(\mathrm{I}_{1}<\mathrm{I}_{2}<\mathrm{I}_{3}\right)$
Marking-scheme solution
Most of the alpha particles pass undeviated through the gold foil.
A few alpha particles, get deflected through $\displaystyle 90$° or more.
Only about $\displaystyle 0.14$% of the incident alpha particles are reflected by large angle.
A very few alpha particles retrace their path. Any other two conclusions
OR
(i)
← Retarding potential
AtomsAlpha-particle Scattering and Rutherford’s Nuclear Model of AtomUnderstandvery_short_answermedium
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CBSE Class 12 Physics past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.