(a) Draw the graph showing the variation of the number (N) of scattered alpha particles with scattering angle ($\theta$) in Geiger - Marsden experiment. Infer two conclusions from the graph. OR (b) 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 $\nu_1, \nu_2$ and $\nu_3$ ($\nu_1 < \nu_2 < \nu_3$) (ii) the same frequency but different intensities $I_1, I_2$ and $I_3$ ($I_1 < I_2 < I_3$)

Year	Paper Code	Set	Position
CBSE 2022	Series 55-1	Set 1	Question 2
CBSE 2022	Series 55-1	Set 2	Question 3
CBSE 2022	Series 55-1	Set 3	Question 1

• Step 1: Stating the fundamental formula / law statement (+1 Mark)
• Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
• Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)