CAIE IGCSE Physics 2.1.2.4 Random Motion of Microscopic Particles Questions

Practise describing Brownian motion as random particle motion and explaining how it provides evidence for molecular motion with CAIE IGCSE Physics questions and mark schemes.

Exam points

Describe Brownian motion as random particle motion and explain how it provides evidence for molecular motion.

[Maximum number: 2]

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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CAIE IGCSE Physics 2.1.2.4 Random Motion of Microscopic Particles Questions question 1