DP Physics (first assessment 2025)

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Question 19M.2.SL.TZ1.3a

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.SL.TZ1.3a
Level SL Paper 2 Time zone TZ1
Command term Explain Question number a Adapted from N/A
a.
[Maximum mark: 2]
19M.2.SL.TZ1.3a
(a)

Explain why intensity maxima are observed at X and Y.

[2]

Markscheme

two waves superpose/mention of superposition/mention of «constructive» interference ✔

they arrive in phase/there is a path length difference of an integer number of wavelengths ✔

Examiners report

Many candidates were able to discuss the interference that is taking place in this question, but few were able to fully describe the path length difference. That said, the quality of responses on this type of question seems to have improved over the last few examination sessions with very few candidates simply discussing the crests and troughs of waves.

Syllabus sections