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CAIE A-Level Physics 15.3.4 Average Translational Kinetic Energy

Practise comparing kinetic-theory equations to derive Ē = 3/2 kT, calculating molecular kinetic energy and interpreting temperature changes.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • compare pV = 1/3 Nmc² with pV = NkT to deduce the average translational kinetic energy
  • calculate average molecular kinetic energy using Ē = 3/2 kT
  • interpret how molecular kinetic energy changes with thermodynamic temperature

15.3.4—PV = 1/3 Nm<c2> with pV = NkT to deduce that the average translational question 1

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The gas in (b) is now cooled gradually to absolute zero.

On Fig. 2.1, sketch the variation with thermodynamic temperature T of the r.m.s. speed of the molecules of the gas.

Fig. 2.1

Fig. 2.1

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