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CAIE A-Level Physics A2 15.3 Kinetic Theory of Gases Questions

Practise applying kinetic-theory assumptions, deriving gas-pressure and rms-speed relations and linking average molecular kinetic energy to temperature.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • state kinetic-theory assumptions and explain molecular collisions as the source of gas pressure
  • derive and use pV = 1/3 Nmc² and interpret root-mean-square speed
  • deduce and use average translational kinetic energy Ē = 3/2 kT from the ideal-gas and kinetic-theory relationships

Covered syllabus points

15.3.1—The basic assumptions of the kinetic theory of gases15.3.2—How molecular movement causes the pressure exerted by a gas and derive and15.3.3—The root-mean-square speed cr.m.s. is given by c<>215.3.4—PV = 1/3 Nm<c2> with pV = NkT to deduce that the average translational

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