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Thermal physics (A-level only)

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Question 4

An ideal gas is enclosed in a cylindrical storage canister of radius rrr and height h=2rh = 2rh=2r. The gas consists of NNN molecules, each having a mass mmm.

If the root-mean-square speed of the molecules is crmsc_{\text{rms}}crms​, which of the following expressions represents the pressure ppp exerted by the gas on the walls of the canister?

A

mN2πr3crms2\frac{mN}{2\pi r^3} c_{\text{rms}}^22πr3mN​crms2​

B

mN6πr3crms2\frac{mN}{6\pi r^3} c_{\text{rms}}^26πr3mN​crms2​

C

mN3πr3crms2\frac{mN}{3\pi r^3} c_{\text{rms}}^23πr3mN​crms2​

D

mN18πr3crms2\frac{mN}{18\pi r^3} c_{\text{rms}}^218πr3mN​crms2​

Markscheme

Thermal physics (A-level only) Questions

  1. A Level
  2. /Physics
  3. /Thermal physics (A-level only)

48 exam-style questions on AQA A Level Physics Thermal physics (A-level only), covering Thermal energy transfer (A-level only), Ideal gases (A-level only), and Molecular kinetic theory model (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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