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Edexcel IGCSE Physics 5.18 Temperature and Gas Molecule Speed Questions

Compare how gas-particle speed changes with temperature, read mean speed from a curve, and trace how slower wall collisions lower pressure.

Syllabus
First assessment 2019
Course
Physics 4PH1

Exam points

  • Explain why heating increases the average speed of gas molecules and cooling reduces it.
  • Read mean particle speed at a stated temperature from a temperature–speed graph using its curve of best fit.
  • Explain how cooling slows gas particles, reduces wall-collision frequency and force, and lowers pressure.

Edexcel IGCSE Physics 5.18 Temperature and Gas Molecule Speed Questions question 1

[Maximum number: 1]

A student uses a computer simulation to investigate the motion of particles in a gas.
He records the pressure of the gas and the mean speed of the particles in the gas at different temperatures.

The graphs show his results.

Graph 1

Graph 1

Graph 2

Graph 2

The student then calculates the kinetic energy of a single gas particle at each temperature.

Using the curve of best fit on graph 2, determine the mean speed of a gas particle when the gas temperature is 100 degrees C.

mean speed = ............ m/s

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