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CAIE IGCSE Physics 2.1.2.5 And Explain This Motion Sometimes Questions

Practise explaining Brownian motion as random movement caused by collisions between fluid molecules and suspended particles with CAIE IGCSE Physics questions and mark schemes.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • Explain Brownian motion as random movement caused by collisions between fluid molecules and suspended particles.

CAIE IGCSE Physics 2.1.2.5 And Explain This Motion Sometimes Questions question 1

[Maximum number: 4]

Fig. 4.1 shows apparatus used to observe the motion of smoke particles (Brownian motion).

Fig. 4.1

Fig. 4.1

The glass cell has light shining on it from the side.
The smoke particles are seen as bright specks of light when looking through the microscope.

Explain, in terms of forces and the motion of air molecules, the cause of the motion of the smoke particles.

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