DP Physics (last assessment 2024)

Question 21M.2.SL.TZ2.5b.iii

Date	May 2021	Marks available	[Maximum mark: 2]	Reference code	21M.2.SL.TZ2.5b.iii
Level	SL	Paper	2	Time zone	TZ2
Command term	Determine	Question number	b.iii	Adapted from	N/A

b.iii.

[Maximum mark: 2]

21M.2.SL.TZ2.5b.iii

A vertical tube, open at both ends, is completely immersed in a container of water. A loudspeaker above the container connected to a signal generator emits sound. As the tube is raised the loudness of the sound heard reaches a maximum because a standing wave has formed in the tube.

(b.iii)

Between the first and second positions of maximum loudness, the tube is raised through 0.37 m. The speed of sound in the air in the tube is 320 m s⁻¹. Determine the frequency of the sound emitted by the loudspeaker.

[2]

Markscheme

$λ = 0.74 « m »$ ✓

$f = « \frac{c}{λ} = \frac{320}{0.74} = » 430 « Hz »$ ✓

Allow ECF from MP1

Syllabus sections

Core

Core » Topic 4: Waves » 4.2 – Travelling waves

Core » Topic 4: Waves » 4.5 – Standing waves

Core » Topic 4: Waves

Question 21M.2.SL.TZ2.5b.iii

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