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2.1.2a Particle structure and motion in solids, liquids and gases

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Question 79

When microscopic smoke particles suspended in air are observed using a microscope, they are seen to move in a continuous, rapid, and random jerky motion.

What causes a smoke particle to move in this way?

A

convection currents in the air due to heating

B

continuous collisions with a single air molecule at any given instant

C

unbalanced bombardment of the smoke particle on different sides by fast-moving air molecules

D

electrostatic repulsion and attraction between neighboring smoke particles

Markscheme

2.1.2a Particle structure and motion in solids, liquids and gases Questions

  1. IGCSE
  2. /Physics
  3. /2.1.2a Particle structure and motion in solids, liquids and gases

151 exam-style questions on CIE IGCSE Physics 2.1.2a Particle structure and motion in solids, liquids and gases. Each one has a worked solution and a mark scheme showing where the marks go.

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