DP Physics (first assessment 2025)

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Question 22M.2.SL.TZ1.3b

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Date May 2022 Marks available [Maximum mark: 2] Reference code 22M.2.SL.TZ1.3b
Level SL Paper 2 Time zone TZ1
Command term Explain, State Question number b Adapted from N/A
b.
[Maximum mark: 2]
22M.2.SL.TZ1.3b
(b)

State and explain the wavelength of the sound measured at M.

[2]

Markscheme

wavelength = 26 cm ✓


peak to peak distance is the path difference which is one wavelength

OR

this is the distance B moves to be back in phase «with A» ✓

 

Allow 25 – 27 cm for MP1.

Examiners report

Many candidates recognized that the wavelength was 26 cm, but the explanations were lacking the details about what information the graph was actually providing. Examiners were looking for a connection back to path difference, and not simply a description of peak-to-peak distance on the graph. Some candidates did not state a wavelength at all, and instead simply discussed the concept of wavelength or suggested that the wavelength was constant.

Syllabus sections