DP Physics (last assessment 2024)

Question 21N.2.HL.TZ0.2b

Date	November 2021	Marks available	[Maximum mark: 3]	Reference code	21N.2.HL.TZ0.2b
Level	HL	Paper	2	Time zone	TZ0
Command term	Determine	Question number	b	Adapted from	N/A

[Maximum mark: 3]

21N.2.HL.TZ0.2b

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.

(b)

Determine, for particle P, the magnitude and direction of the acceleration at t = 2.0 m s.

[3]

Markscheme

$ϖ = « \frac{2 π}{T} = » \frac{2 π}{4 \times 10^{- 3}}$ OR $1.57 \times 10^{3}$ «s⁻¹» ✓

$a = « ϖ^{2} x_{0} = {(1.57 \times 10^{3})}^{2} \times 6 \times 10^{- 6} = 14.8 \approx » 15$ «ms⁻²» ✓

«opposite to displacement so» to the right ✓

Syllabus sections

Core

Core » Topic 4: Waves » 4.2 – Travelling waves

Core » Topic 2: Mechanics » 2.1 – Motion

Core » Topic 2: Mechanics

Core » Topic 4: Waves

Question 21N.2.HL.TZ0.2b

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