DP Physics (last assessment 2024)

Question 19M.2.HL.TZ2.3b

Date	May 2019	Marks available	[Maximum mark: 2]	Reference code	19M.2.HL.TZ2.3b
Level	HL	Paper	2	Time zone	TZ2
Command term	Calculate	Question number	b	Adapted from	N/A

[Maximum mark: 2]

19M.2.HL.TZ2.3b

The diagram shows the direction of a sound wave travelling in a metal sheet.

(b)

The wave is incident at point Q on the metal–air boundary. The wave makes an angle of 54° with the normal at Q. The speed of sound in the metal is 6010 m s^–1 and the speed of sound in air is 340 m s^–1. Calculate the angle between the normal at Q and the direction of the wave in air.

[2]

Markscheme

$\sin \theta = \frac{{340}}{{6010}} \times \sin {54^0}$ ✔

$\theta = {2.6^0}$ ✔

Examiners report

Many scored full marks on this question. Common errors were using the calculator in radian mode or getting the equation upside down.

Syllabus sections

Core

Core » Topic 4: Waves » 4.1 – Oscillations

Core » Topic 4: Waves

Question 19M.2.HL.TZ2.3b

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