DP Physics (first assessment 2025)

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Question 23M.2.HL.TZ1.3b

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Date May 2023 Marks available [Maximum mark: 2] Reference code 23M.2.HL.TZ1.3b
Level HL Paper 2 Time zone TZ1
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 2]
23M.2.HL.TZ1.3b
(b)

Monochromatic light is incident on two very narrow slits. The light that passes through the slits is observed on a screen. M is directly opposite the midpoint of the slits. x represents the displacement from M in the direction shown.

A student argues that what will be observed on the screen will be a total of two bright spots opposite the slits. Explain why the student’s argument is incorrect.

[2]

Markscheme

light acts as a wave «and not a particle in this situation» ✓

light at slits will diffract / create a diffraction pattern ✓

light passing through slits will interfere / create an interference pattern «creating bright and dark spots» ✓

Syllabus sections