CAIE IGCSE Physics Random Motion as Model Evidence
Practise recognising or drawing the irregular zig-zag motion of suspended microscopic particles as observable evidence for the kinetic particle model.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- describe the observed path as continuous, random, irregular or zig-zag motion
- draw straight sections with sudden direction changes and unequal path lengths
2.1.2.4—Random motion of microscopic particles question 1
Fig. 4.1 shows apparatus used to observe the motion of smoke particles (Brownian motion).
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.
Draw the path of one of the bright specks of light.
[2]
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