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2.1 Kinetic particle model of matter

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Question 208

An experiment is set up to observe the Brownian motion of smoke particles in air.

Consider the following three statements:

  1. The smoke particles move in a continuous, random, zig-zag motion.
  2. The air molecules can be observed directly under a light microscope.
  3. The motion of the smoke particles is caused by uneven collisions with much smaller, fast-moving air molecules.

Which of these statement(s) is/are correct?

A

1 only

B

1 and 3 only

C

2 and 3 only

D

1, 2 and 3

Markscheme

2.1 Kinetic particle model of matter Questions

  1. IGCSE
  2. /Physics
  3. /2.1 Kinetic particle model of matter

321 exam-style questions on CIE IGCSE Physics 2.1 Kinetic particle model of matter, covering 2.1.1 States of matter and changes of state, 2.1.2a Particle structure and motion in solids, liquids and gases, 2.1.2b Gas pressure and particle collisions, 2.1.2c Brownian motion, 2.1.3a The absolute scale of temperature, and 2.1.3b Pressure, volume and temperature of a gas. Each one has a worked solution and a mark scheme showing where the marks go.

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