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Cambridge IGCSE Physics practice

Paper 3 structured question: Particle model

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Particle model

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Paper 3Theory (Core)1 marks

Brownian motion is observed in a fluid containing small particles.

Description

Brownian Motion Observation

In a laboratory, a scientist observes the movement of small particles suspended in water under a microscope. The particles move in a random, zigzag pattern.

  1. a

    State the cause of Brownian motion as observed in the experiment.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Particle model

Paper 3Theory (Core)3 marks

Description

Understanding Brownian Motion

Brownian motion is the random movement of particles in a fluid due to collisions with surrounding molecules. This movement is influenced by temperature and particle size.

  1. a

    Explain how temperature affects Brownian motion.

    Aim for approximately 3 distinct marking points.

    [3]