DP Physics (last assessment 2024)

Question 21N.2.SL.TZ0.2c

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

[Maximum mark: 2]

21N.2.SL.TZ0.2c

(c)

A container is filled with 1 mole of helium (molar mass 4 g mol⁻¹) and 1 mole of neon (molar mass 20 g mol⁻¹). Compare the average kinetic energy of helium atoms to that of neon atoms.

[2]

Markscheme

temperature is the same for both gases ✓

«average» kinetic energy is the same «because $E_{k} = \frac{3}{2} k T$ OR $E_{k}$ depends on $T$ only» ✓

Award [1 max] for a bald statement that kinetic energy is the same.

Syllabus sections

Core

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

Core » Topic 3: Thermal physics

Question 21N.2.SL.TZ0.2c

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