DP Physics (last assessment 2024)

Question 21M.2.SL.TZ2.c

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

[Maximum mark: 2]

21M.2.SL.TZ2.c

The graph shows the variation with temperature T of the pressure P of a fixed mass of helium gas trapped in a container with a fixed volume of 1.0 × 10⁻³m³.

A second container, of the same volume as the original container, contains twice as many helium atoms. The graph of the variation of P with T is determined for the gas in the second container.

Predict how the graph for the second container will differ from the graph for the first container.

[2]

Markscheme

recognizes that pressure will double ✓

graph will be steeper OR gradient will be larger ✓

graph will still go through the origin ✓

MP1 can be expressed as e.g.“ $p \propto n$ ” OR “ $\frac{n R}{V}$ will double”.

Accept $p v = 2 n R T$ for MP1.

Syllabus sections

Core

Core » Topic 3: Thermal physics » 3.2 – Modelling a gas

Core » Topic 3: Thermal physics

Question 21M.2.SL.TZ2.c

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