DP Physics (last assessment 2024)

Question 21N.2.HL.TZ0.2a

Date	November 2021	Marks available	[Maximum mark: 2]	Reference code	21N.2.HL.TZ0.2a
Level	HL	Paper	2	Time zone	TZ0
Command term	Calculate	Question number	a	Adapted from	N/A

[Maximum mark: 2]

21N.2.HL.TZ0.2a

A longitudinal wave travels in a medium with speed 340 m s⁻¹. The graph shows the variation with time t of the displacement x of a particle P in the medium. Positive displacements on the graph correspond to displacements to the right for particle P.

(a)

Calculate the wavelength of the wave.

[2]

Markscheme

$T = 4 \times 10^{- 3}$ «s» or $f = 250$ «Hz» ✓

$λ = 340 \times 4.0 \times 10^{- 3} = 1.36 \approx 1.4$ «m» ✓

Allow ECF from MP1.
Award [2] for a bald correct answer.

Syllabus sections

Core

Core » Topic 4: Waves » 4.2 – Travelling waves

Core » Topic 4: Waves

Question 21N.2.HL.TZ0.2a

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