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Friday, 9 October

JEE Main 2020 · PhysicsMultiple choiceDiagram basedMediumData or graph

JEE Main 8 January 2020, Shift 1, Physics Q18

Question 18 of 75 in this shift, Physics question 18 of 25, Section A.

The graph which depicts the results of Rutherford gold foil experiment with α\alpha-particles is : θ\theta : Scattering angle Y : Number of scattered α\alpha-particles detected (Plots are schematic and not to scale)

The figure, in words

Four candidate graphs of Y against scattering angle theta from 0 to pi (see options).
  1. (1)[figure: graph of Y vs θ\theta (0 to π\pi), straight line decreasing from top-left to bottom-right]
  2. (2)[figure: graph of Y vs θ\theta, concave curve rising from origin and flattening]
  3. (3)[figure: graph of Y vs θ\theta, bell-shaped curve with a single peak at intermediate angle]
  4. (4)[figure: graph of Y vs θ\theta, steeply decreasing convex curve approaching zero at large θ\theta]Official answer

Official answer

Option 4

NTA final key (Jan 2020).

Chapter
Atoms
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.