DP Physics (first assessment 2025)

Question EXE.2.SL.TZ0.b

Date	Example questions Example questions	Marks available	[Maximum mark: 3]	Reference code	EXE.2.SL.TZ0.b
Level	SL	Paper	2	Time zone	TZ0
Command term	Explain	Question number	b	Adapted from	N/A

[Maximum mark: 3]

EXE.2.SL.TZ0.b

The air is a mixture of nitrogen, oxygen and other gases. Explain why the component gases of air in the container have different average translational speeds.

[3]

Markscheme

Average kinetic energy of the molecules is determined by the temperature only ✓

The mass of a molecule is different for each component gas ✓

From $E_{k} = \frac{1}{2} m v^{2}$ , the same $E_{k}$ and different mass implies a different average velocity ✓

Syllabus sections

B. The particulate nature of matter

B. The particulate nature of matter » B.3 Gas laws

Question EXE.2.SL.TZ0.b

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