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JAMB Physics 2012 Question 25

Question 25

Structure of Matter and Kinetic Theory

I. It is a rapid, constant and irregular motion of tiny particles.
II. It gives evidence that tiny particles of matter called molecules exist.
III. It takes place only in gases.
IV. It gives evidence that molecules are in a constant state of random motion.
Which of the combinations above is correct about Brownian motion?

  1. A.I, II and III only
  2. B.II, III and IV only
  3. C.I, III and IV only
  4. D.I, II and IV only.
Show the answer and explanation

Answer: D (I, II and IV only.)

Explanation

Brownian motion is the constant, irregular jiggling of tiny particles, which shows that molecules exist and are always moving. It happens in liquids as well as gases, so III is false.