DP Physics (first assessment 2025)

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Question 20N.2.HL.TZ0.b(i)

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.2.HL.TZ0.b(i)
Level HL Paper 2 Time zone TZ0
Command term Discuss Question number b(i) Adapted from N/A
b(i).
[Maximum mark: 2]
20N.2.HL.TZ0.b(i)

Discuss how the results of the experiment provide evidence for matter waves.

[2]

Markscheme

«the shape of the graph suggests that» electrons undergo diffraction «with carbon nuclei» ✓

only waves diffract ✓

Examiners report

This question was challenging for candidates many of whom seemed to have little idea of the experiment. Many answers discussed deflection, with the idea that forces between the electron and the nucleus causing it to deflect at a particular angle. This was often combined with the word interference to suggest evidence of matter waves. A number of answers described a demonstration the candidates remembered seeing so answers talked about fuzzy green rings.

Syllabus sections